Photometric determination of tin. • Photometric determination of dissolved tin(II) and tin(IV) with 9-phenyl-3-fluorone. • Type: tube test 0-97 • Range: 0.10 - 3.00 mg/l Sn • Sufficient for: 18 determinations • Sea water suitability: yes, after dilution (1:10)

Photometric determination of phosphate. • DIN method: ammonium molybdate reacts with orthophosphate ions to form phosphomolybdic acid. This is reduced to molybdenum blue. For the determination of total phosphate, an acidic oxidation at 100 – 120 °C must preceed to detect poly- and organic phosphates. (Reaction basis according to DIN EN ISO 6878-D11). • REF: 985095 • Type: tube test 0-95 • Messbereich: 0,05 – 0,50 mg/L P (PO4-P); 0,2 - 1,5 mg/L PO43- • Sufficient for: 20 tests • Shelf life: at least 1 year after production • Sea water suitability: yes (ortho-P) • Occasional precipitations after the digestion can be filtered off with membrane filtration kit 0.45 µm (REF 916 50). In case of a high content of organic matter and/or organically bound phosphorus, we recommend digestion with NANOCOLOR® NanOx Metal (REF 918978). • Determination of total phosphorus with NANOCOLOR® NanOx Metall: For phosphorus compounds which are difficult to oxidize, we recommend digestion with NANOCOLOR® NanOx Metal (REF 918978).

Photometric determination of total organic carbon. The determination of TOC is carried out in two steps: 1. Disposing of the inorganic carbon (TIC). 2. Decomposition of the organic carbon (TOC) and detection of the carbon dioxide formed by means of an indicator. Specifications: • Type: tube test 0-75 • Range: 2.0 - 30.0 mg/L C • Sufficient for: 20 determinations • Sea water suitability: no

Photometric determination of total organic carbon. The determination of TOC is carried out in two steps: 1. Disposing of the inorganic carbon (TIC). 2. Decomposition of the organic carbon (TOC) and detection of the carbon dioxide formed by means of an indicator. Specifications: • Type: tube test 0-78 • Range: 20 - 300 mg/L C • Sufficient for: 20 determinations • Sea water suitability: no

Photometric determination of sulfate. Features: • By the addition of barium salts, sulfate forms hardly soluble Barium sulfate. The generated turbidity is measured photometrically at 585 nm. • Due to the patented reagent mixture (DE 102017200310 B3) a more homogenious precipitate is formed. This allows for more precise results with significantly lower fluctuation rates. • The photometric determination is according to DIN ISO 15923-1:2014-07. Specifications: • REF: 985062 • Type: tube test 0-62 • Range: 20 - 200 mg/L SO42- • Sufficient for: 20 determinations • Shelf life: 3 years • Sea water suitability: no