WLN-CA.W.33.4	Determination of the total phosphates content (low level) in water by means of the auto analyser.	in-house method
Principle:	Ammonium molybdate in an acid environment with orthophosphate ions, antimony oxyions and ascorbic acid will form a blue coloured compound. The intensity of the blue colour is measured at 880 nm and is a measure for the phosphate content in question.
Determination:	@Ortho-fosfaat, laag niveau
Performance characteristics:
Reporting limit:	1 ug P/l, matrix dependent
Measurement uncertainty:	25%
Sustainability:	28 days
Sampling bottle:	Plastic , white , 250 ml

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