EN
Tests For: Sulfide in Natural and Waste waters
Tests Range: 0–0.5 mg/L
Reagent Chemistry Used: DPD and potassium dichromate11
Method Detection Limit*: 0.02 mg/L
Limit of Quantification**: 0.06 mg/L
Natural waters containing dissolved hydrogen sulfide and other sulfides are found in certain parts of the world, particularly in areas having hot springs. Sulfides are constituents of many industrial wastes such as those from tanneries, gas plants and chemical works. Sulfides can be toxic to fish and aquatic life; and their presence in water supplies gives rise to undesirable tastes and odours.
The Palintest Sulfide Test provides a simple method of measuring total available sulfide over the range 0–0.5 mg/L and is particularly applicable to natural and drinking waters. Higher levels, such as those found in effluents and waste waters, can be determined by diluting the sample.
This simplified method for the determination of sulfide is based on a reagent containing diethyl-p-phenylene diamine (DPD) and potassium dichromate. Sulfide reacts with this reagent in acidic solution to produce a blue coloured complex. In the absence of sulfide, the reagent produces a pink colour. Chlorine, and other oxidizing agents which normally react with DPD, do not interfere with the test. The reagents are provided in the form of two tablets and the test is simply carried out by adding one of each tablet to a sample of the water.
The colour produced is indicative of the sulfide concentration and is measured using a Palintest Photometer.
