ÖNORM EN ISO 10304-1

This part of ISO 10304 specifies a method for the determination of fluoride, chloride, nitrite, orthophosphate, bromide, nitrate and sulfate in water with low contamination (e.g. drinking water, rain water, ground water and surface water) in the following ranges: Fluoride (F): 0,Ol mg/1 to IO mg/l Chloride (Cl): 0,l mg/l to 50 mg/l Nitrite (NO,): 0,05 mg/l to 20 mg/l Orthophosphate (PO,): 0,l mg/l to 20 mg/1 Bromide (Br): 0,05 mg/l to 20 mg/l Nitrate (NO,): 0,l mg/l to 50 mg/1 Sulfate (SO,): 0,l mg/1 to 100 mg/1 NOTE 1 Anion Symbols are used without charges throughout the text. In certain cases, the range of application may be changed by variations in the working conditions (e.g. Sample volume, dilution, separating columns, preconcentration techniques, sensitivity ranges of detectors, etc.). 1.2 Interferences 1.2.1 Some organic acids, such as malonic acid, malcic acid and malic acid, may interfere in the determination of inorganic anions if they are present in high concentrations. 1.2.2 The determination of fluoride in particular is subject to interference by formic acid, acetic acid and carbonate, even at low concentrations. 1.2.3 Cross sensitivity (lack of resolution) may occur in the case of large differentes in concentration between the anions determined (F, Cl, NO,, PO,, Br, NO,, SO,). 1.2.4 The bromide and Phosphate anions do not interfere in the working range specified, unless otherwise stated. 1.2.5 In a buffered eluent (e.g. carbonate/hydrogencarbonate), the determination will not be influenced by the Sample pH in the range of pH 2 to pH 9. 1.2.6 The concentration ratios given in table 1 were checked experimentally for various representative conditions. No interferences could be observed when 50 ~1 of Sample volume was used for the chromatographic analysis. 1.2.7 The information in 1.2.4 to 1.2.6 is valid only as long as the quality requirements of the separating (...abbreviated)