Overview
- We have responded with an expansive selection of professionally manufactured specialty test kits for every job. With industry-leading innovation and quality built into every kit, there is never a need to own multiple test kits or reagents that you won’t use. You’ll never have to choose between accuracy and convenience-they’re always packaged together, in every water test kit.
  
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Properties

Details

Analyte	System	Method/Chemistry	Standard/Equivalance or Description	Comparator	Cell
Sulfite (Sodium)	Drop test	Iodometric	1 drop = 10 ppm Na₂SO₃	NA	9198W
Alkalinity, P/T	Drop test	Phenolphthalein/blended indicator	1 drop = 10 ppm P/T alkalinity as CaCO₃	NA	9198G
Polymer, Free	Visual determination	Turbidimetric	0, 2, 5, 7, 10 ppm polymer as PAA (polyacrylic acid)	5190	9198
Chloride	Drop test	Argentometric (high pH waters)	1 drop = 10 ppm Clˉ	NA	9198O
Hardness, Total	Drop test	EDTA titration (includes inhibitors to prevent metal interference)	1 drop = 10 ppm total hardness as CaCO₃	NA	9198
Hardness, Total (trace)	Drop test	EDTA titration (includes inhibitors to prevent metal interference)	1 drop = 0.5 ppm total hardness as CaCO₃	NA	9198B

Storage

All reagents have a shelf life, whether they are liquids, powders, crystals, tablets, or test-strip pads. If kept dry, powders and crystals are very stable; acids are also long lived. Date of manufacture is not the controlling factor when it comes to shelf life-storage conditions are more important. As with all perishables, reagents are sensitive to environmental influences and will last longer under controlled conditions.

To this end, we recommend:
• Storing reagents at a consistent temperature in the range if 36°-85°F (2°-29°C); extreme temperature fluctuation, say from a refrigerator to a hot car trunk, causes reagents to deteriorate.
• Keeping them out of prolonged direct sunlight. (Note: their brown plastic bottles help protect very light-sensitive reagents.)
• Segregating reagents from containers of treatment chemicals.
• Replacing caps immediately and tightening them carefully so that exposure to air and humidity is limited.
• Avoiding switching bottle caps, placing bottle caps on soiled surfaces, repouring reagents into contaminated containers, or touching test strip pads.

We formulate reagents to remain effective for at least one year, with only very few exceptions (molybdenum indicator in liquid form is one; after four months old it should be tested against a standard periodically). As a general precaution, replace all reagents more than one year old, or at the beginning of a new testing season.

Research Field

Market: Industrial

* For research use only.

Applications

Application

Boiler/Cooling Tower

Application Description

Test Parameter	Description
Erythorbic acid, sulfide and ferrous iron may cause positive interference; to prevent, test for suspected interfering agent, dilute sample with DI water as necessary, and retest. Copper and nitrite may cause negative interference; to prevent, test for suspected interfering agent, dilute sample with DI water as necessary, and retest. Delay between taking sample and testing may cause negative interference; to prevent, perform test immediately after sample is taken. Quats may cause interference by forming a precipitate and causing a yellow endpoint.	Sulfite
Orthophosphate at concentrations greater than 25 ppm will precipitate as silver phosphate to cause positive interference. This can be prevented by diluting orthophosphate concentrations below 25 ppm with DI water. Bromide, iodide, and cyanide at all levels titrate as equivalent chloride concentrations. Sulfide, thiosulfate, and sulfite interfere but can be removed by treatment with hydrogen peroxide. Quats may interfere; to prevent add 10 drops of R-0884.	Chloride
High halogen level may change indicator reaction from green/red to blue/yellow; to prevent, add thiosulfate prior to testing. Filming amines, quats, and biguanides may interfere and cause the endpoint to look purple; to prevent, add 10 drops of R-0884 prior to testing.	Alkalinity-P/T
Metal ions may cause interference; to prevent, add titrant containing EDTA to sample before buffer and indicator, then test as normal making sure to count drops of titrant added initially in total required to reach endpoint. If interference still occurs, dilute sample with DI water as necessary and retest. Quats may cause interference.	Hardness-total
Cationic surfactants and polyphosphates may cause positive interferences. Negative interferences may be caused by anionic surfactants, azoles, iron, molybdenum > 10 ppm, fluoride > 20 ppm, glutaraldehyde > 50 ppm, PBTC, HEDP, ATMP, orthophosphate, silica, zinc > 100 ppm, alkalinity > 300 ppm CaCO₃, hardness > 700 ppm CaCO₃, sulfate > 1000 ppm, and TDS > 1500 ppm.	Polymer
Metal ions may cause interference; to prevent, add titrant containing EDTA to sample before buffer and indicator, then test as normal making sure to count drops of titrant added initially in total required to reach endpoint. If interference still occurs, dilute sample with DI water as necessary and retest. Quats may cause interference.	Hardness-trace