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Taylor K-9105: Boiler and Cooling Water Test Kit:
Taylor K-1141
Boiler and Cooling Water Test Kit
  
Taylor K-9105
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Taylor K-9105

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DROP TEST CHLORIDE (1 drop = 2, 10, or 100 ppm)

COMPONENTS: 1 x 4078 Pipet, Graduated, 3 mL (0.5 mL div.), plastic 1 x 5021 Instruction 1 x 9198 Sample Tube, Graduated, 25 mL, plastic w/cap 1 x R-0630 Chromate Indicator, DB 1 x R-0638 Phenolphthalein Indicator, DB 1 x R-0686 Sulfuric Acid N, DB 1 x R-0807 Silver Nitrate Reagent, DB

NOTE: When sulfite content of sample water to be tested exceeds 10 ppm, the sulfite should be oxidized to prevent interference in test. A 25 mL water sample is first adjusted to the appropriate pH, then 1 mL (or 24 drops) of R-0649 3% Hydrogen Peroxide Solution (sold separately) is added and thoroughly mixed. Continue with the rest of the procedure.

1. Select sample size. Desired Equivalence Sample Size

1 drop = 2 ppm 25 mL 1 drop = 10 ppm
5 mL 1 drop = 100 ppm 0.5 mL

2. Using a 3 mL pipet (#4078) or a 25 mL sample tube (#9198), add desired sample size (Step 1) to 25 mL sample tube. If necessary, dilute 0.5 or 5 mL sample to 10 mL mark with distilled, deionized, or chloride-free water.
3. Add 2 drops R-0638 Phenolphthalein Indicator. Swirl to mix. If sample turns red, add R-0686 Sulfuric Acid N dropwise, swirling after each drop, until color changes from red to colorless.
4. Add 5 drops R-0630 Chromate Indicator. Swirl to mix. Sample should turn yellow.
5. Add R-0807 Silver Nitrate Reagent dropwise, swirling and counting after each drop, until color changes from yellow to a milky salmon (brick) red. Always hold bottle in vertical position.

NOTE: Do not add enough R-0807 Silver Nitrate Reagent to give a brown color. First change from yellow to a milky salmon (brick) red is the endpoint.

6. Multiply drops of R-0807 Silver Nitrate Reagent by desired equivalence factor (Step 1). Record as parts per million (ppm) chloride.

DROP TEST SODIUM NITRITE

(1 drop = 50 ppm) COMPONENTS: 1 x 4026 Dipper, 2 g, plastic, large 1 x 4086 Stirring Rod, 5", plastic 1 x 5045 Instruction 1 x 9010 Pipet, Calibrated 0.5 & 1.0 mL, plastic w/red cap 1 x 9198R Sample Tube, Graduated, 25 mL, plastic w/cap and red dot 1 x R-0733-C Permanganate Reagent, 2 oz 1 x R-0781-II Acid Sulfate, 50 g

1. Rinse and fill 25 mL sample tube (#9198R) to 25 mL mark with water to be tested.
2. Using a large dipper (#4026), add 1 dipper R-0781 Acid Sulfate. Stir with rod (#4086) to dissolve.
3. Using a 1.0 mL pipet (#9010), add R-0733 Permanganate Reagent dropwise, swirling and counting after each drop, until color changes from colorless to a faint but permanent pink, which persists for at least 1 minute. Always hold pipet in vertical position.
4. Multiply drops of R-0733 Permanganate Reagent by 50. Record as parts per million (ppm) sodium nitrite.

NOTE: For results as nitrite, multiply sodium nitrite concentration by 0.67.

DROP TEST PHOSPHONATE EQUIVALENCE (PPM)

COMPONENTS: 1 x 5051 Instruction 1 x 9198P Sample Tube, Graduated, 25 mL, plastic w/cap and purple dot 1 x 9315 Test Paper, pH, 1.8-3.8 1 x R-0686P-C Sulfuric Acid N (purple cap), 2 oz, DB 1 x R-0697-C Thiosulfate N/10, 2 oz, DB 1 x R-0802P-I XO Indicator Powder, 10 g 1 x R-0803-C Phosphonate Titrating Solution, 2 oz, DB 1 x R-0805-C Fluoride Masking Agent, 2 oz, DB

NOTE: Iron can cause negative interference at a level greater than 5 ppm. Orthophosphate and polyphosphate can cause positive interference at all levels. NOTE: Run a blank using tap water. Normal blank requires about 2 drops of R-0803 Phosphonate Titrating Solution to reach endpoint.

1. Rinse and fill 25 mL sample tube (#9198P) to 25 mL mark with water to be tested.
2. Add: 1 drop R-0697 Thiosulfate N/10 10 drops R-0805 Fluoride Masking Agent 1 level dipper R-0802P XO Indicator Powder Swirl to mix.
3. Adjust pH between 2.6 and 3.0: Add 1 drop R-0686P Sulfuric Acid N. Swirl to mix. Dip test paper (#9315) into sample, in direction of arrow, for 3 seconds, with all color zones immersed. Match indicator zone (unnumbered square between 2.7 and 3.0 color standards) with color scale. Read printed pH value. If necessary, continue adding R-0686P Sulfuric Acid N dropwise, swirling and checking pH with a new test paper after each drop, until a pH between 2.6 and 3.0 is obtained. Sample should be yellow.
4. Add R-0803 Phosphonate Titrating Solution dropwise, swirling and counting after each drop, until color changes from yellow to purple-pink. Always hold bottle in vertical position.
5. Subtract drops of R-0803 Phosphonate Titrating Solution in blank from drops in sample (Step 4). Multiply by appropriate conversion factor (see CONVERSION FACTORS). Record as parts per million (ppm) phosphonate.

MIDGET COMPARATOR TEST ORTHOPHOSPHATE (HIGH) (10-100 ppm)

MIDGET:

9350 (10, 20, 30, 40, 50, 60, 80, 100 ppm)

REAGENTS: R-0601 Molybdate Reagent* R-0602P Stannous Chloride Powder

APPARATUS: 4 x 2269 Caps, 18 mm Dispenser, plastic 1 x 5122 Instruction 1 x 6003 Brush, Test Tube 1 x 9021 Test Tube, Mixing, Calibrated 5, 10, 14, 15, 17.5 mL, glass w/stopper

1. Filter water to be tested to clarify (see Instruction #5860 or #5861).
2. Rinse and fill mixing test tube (#9021) to 5 mL mark with filtered sample.
3. Cap R-0601 Molybdate Reagent* with dispenser cap (#2269). Add R-0601 Molybdate Reagent* to 15 mL mark. Stopper and mix. Remove stopper.
4. Add 2 level dippers R-0602P Stannous Chloride Powder. Stopper and mix.
5. Wipe dry and place in comparator. WAIT 1 MINUTE. Read before 10 minutes.
6. Match color in test tube with a color standard. Record as parts per million (ppm) orthophosphate.

*WARNING: Molybdate Reagent (R-0601) contains 8.1% sulfuric acid, a corrosive acid.

MIDGET COMPARATOR TEST COPPER (0.2-3.0 ppm)

MIDGET: 9049 (0.2, 0.4, 0.6, 0.8, 1.0, 1.5, 2.0, 3.0 ppm)

REAGENTS: R-0860 Copper Reagent #1* R-0861 Copper Reagent #2** APPARATUS: 1 x 3243 Cap, Test Cell, 11.5 mL, rectangular, plastic 1 x 4024 Test Cell, Calibrated 11.5 mL, plastic 2 x 4030 Pipets, Calibrated 0.5 & 1.0 mL, plastic w/cap 1 x 5128 Instruction 1 x 6002 Brush, Cell Cleaner.

1. Rinse and fill 11.5 mL test cell (#4024) to 11.5 mL mark with water to be tested.
2. Using a 1.0 mL pipet (#4030), add 0.5 mL R-0860 Copper Reagent #1*. Cap and mix.
3. Using a different 1.0 mL pipet, add 0.5 mL R-0861 Copper Reagent #2**. Cap and mix.
4. Wipe dry and place in comparator WITH FROSTED SIDE FACING OPERATOR. WAIT 5 MINUTES.
5. Match color in test cell with a color standard. Record as parts per million (ppm) copper.

* WARNING: Copper Reagent #1 (R-0860) contains 4.4% ammonium hydroxide, a corrosive alkali.
**WARNING: Copper Reagent #2 (R-0861) contains 44% isopropanol (w/w), a flammable liquid.

MIDGET COMPARATOR TEST COPPER (0.2-3.0 ppm)

MIDGET: 9049 (0.2, 0.4, 0.6, 0.8, 1.0, 1.5, 2.0, 3.0 ppm)

REAGENTS: R-0860 Copper Reagent #1* R-0861 Copper Reagent #2** APPARATUS: 1 x 3243 Cap, Test Cell, 11.5 mL, rectangular, plastic 1 x 4024 Test Cell, Calibrated 11.5 mL, plastic 2 x 4030 Pipets, Calibrated 0.5 & 1.0 mL, plastic w/cap 1 x 5128 Instruction 1 x 6002 Brush, Cell Cleaner.

1. Rinse and fill 11.5 mL test cell (#4024) to 11.5 mL mark with water to be tested.
2. Using a 1.0 mL pipet (#4030), add 0.5 mL R-0860 Copper Reagent #1*. Cap and mix.
3. Using a different 1.0 mL pipet, add 0.5 mL R-0861 Copper Reagent #2**. Cap and mix.
4. Wipe dry and place in comparator WITH FROSTED SIDE FACING OPERATOR. WAIT 5 MINUTES.
5. Match color in test cell with a color standard. Record as parts per million (ppm) copper.

*WARNING: Copper Reagent #1 (R-0860) contains 4.4% ammonium hydroxide, a corrosive alkali.

**WARNING: Copper Reagent #2 (R-0861) contains 44% isopropanol (w/w), a flammable liquid.

MIDGET COMPARATOR TEST IRON (0-2.0 ppm)

MIDGET: 9051 (0, 0.2, 0.4, 0.6, 0.8, 1.0, 1.5, 2.0 ppm)

REAGENTS: R-0851 Iron Reagent #1* R-0852 Iron Reagent #2

APPARATUS: 1 x 3243 Cap, Test Cell, 11.5 mL, rectangular, plastic 1 x 4024 Test Cell, Calibrated 11.5 mL, plastic 2 x 4030 Pipets, Calibrated 0.5 & 1.0 mL, plastic w/cap 1 x 5129 Instruction 1 x 6002 Brush, Cell Cleaner.

. Rinse and fill 11.5 mL test cell (#4024) to mark with water to be tested.
2. Using a 1.0 mL pipet (#4030), add 0.5 mL R-0851 Iron Reagent #1*. Cap and mix. WAIT 2 MINUTES.
3. Using a different 1.0 mL pipet, add 1.0 mL R-0852 Iron Reagent #2. Cap and mix.
4. Wipe dry and place in comparator WITH FROSTED SIDE FACING OPERATOR.
5. Match color in test cell with a color standard. Record as parts per million (ppm) iron.

*WARNING: Iron Reagent #1 (R-0851) contains 8.8% hydrochloric acid, a corrosive acid.

SLIDE & MIDGET COMPARATOR TEST ORTHOPHOSPHATES & POLYPHOSPHATES

IN GENERAL This method is based on the formation of phosphomolybdic acid which is subsequently reduced with stannous chloride to produce a blue color whose intensity is proportional to the phosphate (PO4) present. Interferences are reduced to a minimum. The presence of 10,000 ppm of silica (SiO2), 100 ppm of ferrous or ferric iron, or 1000 ppm of sulfite causes no error. The water to be tested must be carefully filtered with a good grade of filter paper to free it from sludge and scale. Mere traces of sludge will cause serious errors. If repeated filtration does not clarify the water, add 0.5 grams potassium nitrate crystals to 25 mL of the sample water, heat to boiling, cool, dilute to 25 mL with distilled water, and filter. If the water is very highly colored by tannin or other highly colored organic matter, so that a phosphate determination is difficult or impossible, it can be effectively decolorized with R-0727 Activated Charcoal. Add half a teaspoon of activated charcoal to a pint container of the colored sample water. Close the container and shake sample well. Decolorization should take place in from 5 to 15 minutes. The treated sample is then filtered as instructed above. From this point on follow the procedure outlined in the Orthophosphate or Polyphosphate tests.

DROP TEST P/M ALKALINITY (1 drop = 50 ppm)


COMPONENTS: 1 x 5201 Instruction 1 x 9198 Sample Tube, Graduated, 25 mL, plastic w/cap 1 x R-0637 Methyl Orange Indicator, DB 1 x R-0638 Phenolphthalein Indicator, DB 1 x R-0736 Sulfuric Acid .6N, DB

P/M Alkalinity

1. Rinse and fill 25 mL sample tube (#9198) to 25 mL mark with water to be tested. NOTE: For results in grains per gallon (gpg), fill to 14.6 mL mark.
2. Add 3 drops R-0638 Phenolphthalein Indicator. Swirl to mix. If P alkalinity is present, sample will turn pink, go to Step
3. If sample is colorless, no P alkalinity is present, go to Step 4.
3. Add R-0736 Sulfuric Acid .6N dropwise, swirling and counting after each drop, until color changes from pink to colorless. Record number of drops as P reading. Always hold bottle in vertical position.
4. Add 3 drops R-0637 Methyl Orange Indicator. Swirl to mix. Sample should turn yellow.
5. Add R-0736 Sulfuric Acid .6N dropwise, swirling and counting after each drop, until color changes from yellow to orange (salmon pink). Record total number of drops (Steps 3 and 5) as M reading. Always hold bottle in vertical position.
6. Multiply P reading (Step 3) by 50. Record as parts per million (ppm) P alkalinity as calcium carbonate. Multiply M reading (Step 5) by 50. Record as ppm M alkalinity as calcium carbonate. For 14.6 mL sample, multiply P reading by 5. Record as grains per gallon (gpg) P alkalinity as calcium carbonate. Multiply M reading by 5. Record as gpg M alkalinity as calcium carbonate.

DROP TEST SODIUM SULFITE (1 drop = 10 ppm)

COMPONENTS: 1 x 5203 Instruction 1 x 9198W Sample Tube, Graduated, 25 mL, plastic w/cap and white dot 1 x R-0699-C Iodide Iodate Reagent, 2 oz, DB 1 x R-0638W-C Phenolphthalein Indicator (white cap), 2 oz, DB 1 x R-0725-I Acid Starch Indicator Powder, 10 g

1. Collect water to be tested in a clean, preferably large-mouthed, bottle to overflowing. Immediately cap and cool to room temperature.
2. Rinse and fill 25 mL sample tube (#9198W) to 25 mL mark with cooled (room temperature) water to be tested. NOTE: For results in grains per gallon (gpg), fill to 14.6 mL mark.
3. Add 1 drop R-0638W Phenolphthalein Indicator. Swirl to mix. Sample should turn red.
4. Add R-0725 Acid Starch Indicator Powder, a dipper at a time, swirling after each dipper, until color changes from red to colorless. Add 2 more dippers. Swirl until dissolved.
5. Add R-0699 Iodide Iodate Reagent dropwise, swirling and counting after each drop, until color changes from colorless to a faint but permanent blue. Always hold bottle in vertical position.
6. Multiply drops of R-0699 Iodide Iodate Reagent by 10. Record as parts per million (ppm) sodium sulfite. For 14.6 mL sample, record drops as grains per gallon (gpg) sodium sulfite.

DROP TEST TRACE HARDNESS (1 drop = 0.5 ppm)

COMPONENTS: 1 x 5226 Instruction 1 x 9198B Sample Tube, Graduated, 25 mL, plastic w/cap and blue dot 1 x R-0620B-I Hardness Indicator Powder (blue dot), 10 g 1 x R-0622-C Trace Hardness Buffer, 2 oz, DB 1 x R-0623-C Trace Hardness Reagent, 2 oz, DB.

1. Rinse and fill 25 mL sample tube (#9198B) to 25 mL mark with water to be tested.
2. Add 5 drops R-0622 Trace Hardness Buffer. Swirl to mix.
3. Add 1 dipper R-0620B Hardness Indicator Powder. Swirl to mix. If hardness is present, sample will turn red, go to Step 4. If no hardness is present, sample will turn blue.
4. Add R-0623 Trace Hardness Reagent dropwise, swirling and counting after each drop, until color changes from red to blue. Always hold bottle in vertical position.
5. Multiply drops of R-0623 Trace Hardness Reagent by 0.5. Record as parts per million (ppm) hardness as calcium carbonate.

DROP TEST TOTAL HARDNESS (1 drop = 10 or 50 ppm)

COMPONENTS: 1 x 4078 Pipet, Graduated, 3 mL (0.5 mL div.), plastic 1 x 5227 Instruction 1 x 9198 Sample Tube, Graduated, 25 mL, plastic w/cap 1 x R-0619 Hardness Buffer, DB 1 x R-0620 Hardness Indicator Powder 1 x R-0683 Hardness Reagent, DB.

1. Select sample size. Desired Equivalence Sample Size

1 drop = 10 ppm 25 mL
1 drop = 50 ppm 5 mL

2. Using a 3 mL pipet (#4078) or 25 mL sample tube (#9198), add desired sample size (Step 1) to 25 mL sample tube.
3. Add 5 drops R-0619 Hardness Buffer. Swirl to mix.
4. Add 1 dipper R-0620 Hardness Indicator Powder. Swirl to mix. If hardness is present, sample will turn red.
5. Add R-0683 Hardness Reagent dropwise, swirling and counting after each drop, until color changes from red to blue. Always hold bottle in vertical position.
6. Multiply drops of R-0683 Hardness Reagent by desired equivalence factor (Step 1). Record as parts per million (ppm) total hardness as calcium carbonate.

MIDGET COMPARATOR TEST SILICA (5-50, 25-250 or 50-500 ppm)

MIDGET: 9257 (5, 10, 15, 20, 25, 30, 40, 50 ppm)

REAGENTS: 1 x R-1305Q-II Silica Reagent #4, 50 g 1 x R-1305U-C Silica Reagent #3*, 2 oz 1 x R-1306T-C Silica Reagent #1**, 2 oz 1 x R-1306U-C Silica Reagent #2, 2 oz APPARATUS: 1 x 3267 Cap, Test Cell, 5 mL, plastic 1 x 4005 Cylinder, Graduated, 50 mL (1 mL div.), glass 1 x 4025 Test Cell, Calibrated 5 mL, plastic 1 x 4026 Dipper, plastic, large 3 x 4030 Pipets, Calibrated 0.5 & 1.0 mL plastic w/cap 1 x 5321 Instruction 1 x 6002 Brush, Cell Cleaner 1 x 9198 Sample Tube, Graduated, 25 mL, plastic w/cap

For 5-50 ppm Silica

1. Rinse and fill 25 mL sample tube (#9198) to 25 mL mark with water to be tested.
2. Using a 1.0 mL pipet (#4030), add 1.0 mL R-1306T Silica Reagent #1**. Swirl to mix.
3. Using a separate 1.0 mL pipet, add 1.0 mL R-1306U Silica Reagent #2. Swirl to mix. WAIT 5 MINUTES.
4. Using a separate 1.0 mL pipet, add 1.0 mL R-1305U Silica Reagent #3*. Swirl to mix.
5. Using a large dipper (#4026), add 1 level dipper R-1305Q Silica Reagent #4. Swirl until dissolved. WAIT 1 MINUTE. Transfer to 5 mL test cell (#4025) to 5 mL mark.
6. Wipe dry and place in comparator WITH FROSTED SIDE FACING OPERATOR.
7. Match color in test cell with a color standard. Record as parts per million (ppm) silica.

For 5-250 ppm Silica

1. Rinse and fill 50 mL graduated cylinder (#4005) to 10 mL mark with water to be tested.
2. Dilute to 50 mL mark with distilled, deionized, or silica-free water. Pour back and forth into 25 mL sample tube (#9198) to mix. Transfer to 25 mL sample tube to 25 mL mark.
3. Using a 1.0 mL pipet (#4030), add 1.0 mL R-1306T Silica Reagent #1**. Swirl to mix.
4. Using a separate 1.0 mL pipet, add 1.0 mL R-1306U Silica Reagent #2. Swirl to mix. WAIT 5 MINUTES.
5. Using a separate 1.0 mL pipet, add 1.0 mL R-1305U Silica Reagent #3*. Swirl to mix.
6. Using a large dipper (#4026), add 1 level dipper R-1305Q Silica Reagent #4. Swirl until dissolved. WAIT 1 MINUTE. Transfer to 5 mL test cell (#4025) to 5 mL mark.
7. Wipe dry and place in comparator WITH FROSTED SIDE FACING OPERATOR.
8. Match color in test cell with a color standard. Multiply reading by 5. Record as parts per million (ppm) silica.

For 5-500 ppm Silica

1. Rinse and fill 50 mL graduated cylinder (#4005) to 5 mL mark with water to be tested.
2. Dilute to 50 mL mark with distilled, deionized, or silica-free water. Pour back and forth into 25 mL sample tube (#9198) to mix. Transfer to 25 mL tube to 25 mL mark.
3. Using a 1.0 mL pipet (#4030), add 1.0 mL R-1306T Silica Reagent #1**. Swirl to mix.
4. Using a separate 1.0 mL pipet, add 1.0 mL R-1306U Silica Reagent #2. Swirl to mix. WAIT 5 MINUTES.
5. Using a separate 1.0 mL pipet, add 1.0 mL R-1305U Silica Reagent #3*. Swirl to mix.
6. Using a large dipper (#4026), add 1 level dipper R-1305Q Silica Reagent #4. Swirl until dissolved. WAIT 1 MINUTE. Transfer to 5 mL test cell (#4025) to 5 mL mark.
7. Wipe dry and place in comparator WITH FROSTED SIDE FACING OPERATOR.
8. Match color in test cell with a color standard. Multiply reading by 10. Record as parts per million (ppm) silica.

*WARNING: Silica Reagent #3 (R-1305U) contains 10% oxalic acid, a poison.
**WARNING: Silica Reagent #1 (R-1306T) contains 14.7% (w/v) hydrochloric acid, a corrosive acid.

DROP TEST MOLYBDENUM (1 drop = 2, 5, 20 or 50 ppm)

COMPONENTS: 1 x 4029 Pipet, Calibrated 0.5 & 1.0 mL, plastic 2 x 4030 Pipets, Calibrated 0.5 & 1.0 mL, plastic w/cap 1 x 4078 Pipet, Graduated, 3 mL (0.5 mL div.), plastic 1 x 5359 Instruction 3 x 9198 Sample Tubes, Graduated, 25 mL, plastic w/cap 1 x R-0890 Molybdenum Buffer Solution 1 x R-0892 Molybdenum Titrating Solution, DB 1 x R-0900 Molybdenum Indicator Powder 1 x R-0901 Molybdenum Indicator Solvent

Molybdenum Indicator Solution Preparation:

For 1 drop = 2, 20, or 50 ppm Mo

Using a 1.0 mL pipet (#4030), add 2.5 mL R-0901 Molydenum Indicator Solvent to a clean 25 mL sample tube. Add 5 level dippers R-0900 Molybdenum Indicator Powder. Swirl until solution turns a clear, red-orange color. Undissolved crystals will remain in the solvent-powder mixture.

For 1 drop = 5 ppm Mo

Using a 1.0 mL pipet (#4030), add 1.5 mL R-0901 Molydenum Indicator Solvent to a clean 25 mL sample tube. Add 3 level dippers R-0900 Molybdenum Indicator Powder. Swirl until solution turns a clear, red-orange color. Undissovled crystals will remain in the solvent-powder mixture.

For 1 drop = 2 ppm Mo

1. Rinse and fill a clean 25 mL sample tube (#9198) to 25 mL mark with distilled, deionized, or molybdenum-free tap water. This will be the blank.
2. Rinse and fill a second clean 25 mL sample tube to 25 mL mark with water to be tested.
3. Using a 1.0 mL pipet (#4030), add 1.0 mL R-0890 Molybdenum Buffer Solution to each 25 mL sample tube. Swirl to mix.
4. Using a separate 1.0 mL pipet (#4029), add 1.0 mL Molybdenum Indicator Solution (prepared above) to each sample tube, transferring as few undissolved crystals as possible. However, a few crystals that may be transferred will not affect results. Swirl to mix. The blank should turn peach and the sample will turn red-orange to red if molybdenum is present.
5. Add R-0892 Molybdenum Titrating Solution, dropwise, swirling and counting after each drop, to sample tube containing water sample, until sample color matches blank color, or until no further change in color occurs. Always hold bottle in vertical position.
6. Multiply drops of R-0892 Molybdenum Titrating Solution by 2. Record as parts per million (ppm) molybdenum. NOTE: To convert molybdenum (Mo) readings to molybdate (MoO4), multiply Mo readings by 1.7; to convert to sodium molybdate dihydrate (Na2MoO4.2H2O), multiply by 2.52.

For 1 drop = 5 ppm Mo

1. Rinse and fill a clean 25 mL sample tube (#9198) to 10 mL mark with distilled, deionized, or molybdenum-free tap water. This will be the blank
2. Rinse and fill a second clean 25 mL sample tube to 10 mL mark with water to be tested.
3. Using a 1.0 mL pipet (#4030), add 0.5 mL R-0890 Molybdenum Buffer Solution to each 25 mL sample tube. Swirl to mix.
4. Using a separate 1.0 mL pipet (#4029), add 0.5 mL Molybdenum Indicator Solution (prepared above) to each sample tube, transferring as few undissolved crystals as possible. However, a few crystals that may be transferred will not affect results. Swirl to mix. The blank should turn peach and the sample will turn red-orange to red if molybdenum is present.
5. Add R-0892 Molybdenum Titrating Solution, dropwise, swirling and counting after each drop, to sample tube containing water sample, until sample color matches blank color, or until no further change in color occurs. Always hold bottle in vertical position.
6. Multiply drops of R-0892 Molybdenum Titrating Solution by 5. Record as parts per million (ppm) molybdenum.

NOTE: To convert molybdenum (Mo) readings to molybdate (MoO4), multiply Mo readings by 1.7; to convert to sodium molybdate dihydrate (Na2MoO4.2H2O), multiply by 2.52.

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