Photometric determination of lead. • Photometric determination with dithizone. • At pH 7 to 9 in the presence of cyanide lead(II) ions react with dithizone to form primary lead dithizonate, which is soluble in carbon tetrachloride with high selectivity yielding a pink solution (extraction method). • Type standard test 1-10 • Ranges: 10 mm cuvette: 0.03 - 1.00 mg/l Pb2+. 50 mm cuvette: 0.005 - 0.500 mg/l Pb2+. • Sufficient for: 25 determinations • Sea water suitability: no • PLEASE NOTE: This test uses extraction methods and contains chlorinated hydrocarbons. If national or international legal limitations for the use, storage or shipment of tetrachlormethane must be observed, this test is also available without CCl4. The tetrachlormethane is requiered for this test and has to be purchased from a local laboratory shop.