For quantitative determination of detergents in e.g. water and soil samples. Key Features: Sensitive and accurate. Use 20 µ L sample. Linear detection range: Tween 80: 0.012 to 4 mM; Tween 20: 0.06 to 5 mM; Triton X-100: 0.23 to 12 mM; Brij L23/35: 0.09 to 5 mM; DTAC: 0.08 to 2 mM; SDS: 10 to 25 mM. Simple and convenient. The procedure involves addition of two reagents and measuring OD560nm or OD650nm. Improved reagent stability and versatility. The optimized formulation has greatly enhanced reagent and signal stability. Cuvette or 96-well plate assay. Method: 560nm and 650nm. Samples: Biological and environmental samples. Species: All. Procedure: Assay takes 15 min. Kit size: 100 tests. Detection limit: Tween 80: 0.012 to 4 mM; Tween 20: 0.06 to 5 mM; Triton X-100: 0.23 to 12 mM; Brij L23/35: 0.09 to 5 mM; DTAC: 0.08 to 2 mM; SDS: 10 to 25 mM.