BS ISO 9197:2016 pdf download – Paper, board and pulps — Determination of water-soluble chlorides 5.4 Nitric acid, c(HNO 3 ) = 1,3 mol/l. Add with caution 82 ml of concentrated nitric acid, c(HNO 3 ) = 15,8 mol/l (about 70 % HNO 3 ), to 500 ml of water (5.1) and dilute to 1 l. 5.5 Additional solutions, as specified in the instructions for the ion chromatograph. 6 Apparatus Glassware and other apparatus used for this analysis shall be scrupulously clean. Soak all glassware for 5 min to 10 min in the nitric acid (5.4) and then rinse thoroughly with water (5.1). Clean, in water, forceps, scissors and the disintegrator used for sample preparation. 6.1 Wet disintegrator, a high-speed mixer, capable of disintegrating the sample completely with minimum damage to the fibres. 6.2 Ion chromatograph, having a pump, an injector loop of known volume, a column system suitable for the determination of chlorides and a conductivity detector. 6.3 Syringe, Class A, of capacity 5 ml and having a prefilter of about 0,2 µm pore width. 6.4 Tea-strainer or similar device, of stainless steel, for removing fibres from a suspension. 7 Sampling and preparation of sample If the test is being made to evaluate a pulp lot, the sample shall be selected in accordance with ISO 7213. If the test is made on another type of sample, report the source of the sample and, if possible, the sampling procedure used. From the sample received, select specimens so that they are representative of the whole sample. The procedure to be followed when sampling depends on the particular circumstances in each case. For sampling from lots of pulp, paper or board, the instructions in ISO 7213 or ISO 186, as relevant, are recommended. Since the amount of chlorides in the sample can be very low, take care not to contaminate it during sampling. Wear clean protective gloves at all times when handling the sample and the test pieces prepared from it. The laboratory where the analysis is made shall be free from dust and fumes from chlorine-containing substances, such as hydrochloric acid or chlorinated solvents. Particular care should be taken in mill- site laboratories if the mill uses chlorine or chlorine dioxide as a bleaching agent. Keep specimens protected, wrapped in aluminium foil or in plastic bags, until required for analysis. Analyse specimens as soon as possible after sampling. Determine the dry...

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