Chlorine Test Kits
|Range||MDL||Method||Type||Kit Cat. No.||Refill|
|0-0.20 ppm||0.04 ppm||DDPD (free & total)||ULR CHEMets||K-2511||R-2511|
|0-1 & 0-5 ppm||0.05 ppm||DPD (free & total)||CHEMets||K-2504||R-2500|
|0-25 & 0-125 ppm||2.5 ppm||DPD (free & total)||CHEMets||K-2504D||R-2504|
|0-50 & 0-250 ppm||5 ppm||DPD (free & total)||CHEMets||K-2504A||R-2504|
|0-100 & 0-500 ppm||10 ppm||DPD (free & total)||CHEMets||K-2504B||R-2509|
|0-400 & 0-2000 ppm||40 ppm||DPD (free & total)||CHEMets||K-2504C||R-2509|
|0-1.55% as NaOCl||0.3%||DPD (hypochlorite)||CHEMets||K-5808||R-5808|
|0-12.5% as NaOCl||2.5%||DPD (hypochlorite)||CHEMets||K-5816||R-5808|
|Range||Method||Type||Kit Cat. No.|
|0-5.00 ppm||DPD (free)*||Vacu-vials||K-2523|
|0-5.00 ppm||DPD (free & total)*||Vacu-vials||K-2513|
|0-5.00 ppm||DPD (free & total)*||SAM Photometer + Vacu-vials||I-2001|
The CHEMetrics test kits for the determination of Chlorine in aqueous solutions are based on patented Self-Filling Reagent Ampoule technology, and employ the DPD and DDPD methods, delivering sensitivity and accuracy within two minutes or less. Premixed. Premeasured. Precise. Each kit contains 30 tests. Suitable for potable water, municipal waste water, cooling tower water and swimming pool testing.
The DPD Method
Diethyl-p-phenylene diamine (DPD) is an industry standard methodology for the determination of Chlorine and is USEPA-accepted. In the DPD method, free chlorine reacts with DPD in the ampoule to form a pink product. When ammonia or amines are present, some of the chlorine may exist as combined chlorine. Combined chlorine will not interfere with the free chlorine results, provided the readings are taken after one minute of colour development in accordance with the test instructions. To determine total chlorine (the sum of free and combined), use the A-2500 Activator Solution (potassium iodide) included in the kit. Results are expressed as ppm (mg/l) Cl2.
The DPD method is also applicable to the direct determination of hypochlorite concentrations in various cleaning preparations and disinfectants prior to their dilution. DPD reacts with hypochlorite ions to form a pink color. Results are expressed as percent (%) NaOCl.
USEPA Methods for Chemical Analysis of Water and Wastes, Method 330.5 (1983).
APHA Standard Methods, 22nd ed., Method 4500-Cl G- 2000.
The DDPD™ Method
The DDPD™ method is derived from the DPD chemistry, and is a dimethyl-substituted form of DPD. Test kits that employ this chemistry are well suited for use where biocides and chromate corrosion inhibitors are used simultaneously. DDPD reacts with free chlorine to form a purple product. When ammonia or amines are present in the sample, some of the chlorine may exist as combined chlorine. To determine total chlorine (the sum of free and combined), use the A-2500 Activator Solution (potassium iodide) included in the kit. Results are expressed as ppm (mg/l) Cl2.
|USEPA Acceptance Letter for CHEMetrics DDPD Chlorine Kits|
* Accepted by USEPA for drinking and waste water using CHEMetrics instrumental DPD Vacu-vials products.
Developed by CHEMetrics, Inc.
Because of its strong oxidising properties, chlorine is an excellent biocide used to treat potable waters, municipal wastes, cooling tower water and swimming pools. When used to treat potable water, chlorine helps alleviate the adverse effects of iron, manganese, ammonia, and sulphide. The World Health Organisation has set a guideline maximum value of 5mg/l residual Cl2, although UK water companies typically keep levels to 0.5mg/l or less.