下面是网上的翻译版本,不知道是不是官方的: VIII A Limit Test for Chlorides
Test preparation Unless otherwise specified, weigh a quantity of the substance being examined as prescribed under individual monographs, dissolve it in about 25 ml of water (if the solution is alkaline, neutralize with nitric acid dropwise). Add 10 ml of dilute nitric acid and filter if necessary, transfer the solution to a 50 ml Nessler cylinder, add water to produce 40 ml and mix well. Reference preparation Transfer a volume of sodium chloride standard solution as prescribed under individual nonographs to a 50 ml Nessler cylinder, add 10 ml of dilute nitric acid and sufficient water to produce 40 ml, mix well. Procedure To each of the Nessler cylinders described above add 1.0 ml of silver nitrate TS, dilute with water to 50 ml and mix well. Allow to stand in the dark for 5 minutes, compare the opalescence produced by viewing down the vertical axis of the cylinders against a black background. If the test preparation is coloured, unless otherwise specified, place two aliquots of the preparation in Nessler cylinders separately, to one cylinder add 1.0 ml of silver nitrate TS, mix and allow to stand for 10 minutes, filter the content of the cylinder repeatedly until the filtrate is perfectly clear, then add the prescribed volume of standard sodium chloride solution to the filtrate, use it as the reference preparation. To the other cylinder add 1.0 ml of silver nitrate TS, use it as the test preparation. Dilute the test preparation and the reference preparation with water to 50 ml, mix well and allow to stand in the dark for 5 minutes, compare the opalescence as described above. Sodium chloride standard solution Dissolve 0.165 g of sodium chloride in water in a 1000 ml volumetric flask, and dilute to the volume, mix well (stock solution). Transfer 10 ml of the stock solution, accurately measured, into a 100ml volumetric flask immediately before use, dilute with water to the volume and mix well (each ml is equivalent to 10μg of Cl). Annotations The filter paper used in this test, if necessary, should be previously washed with water containing nitric acid until the washing is free from chlorides. 2009.09.10
由于没有人愿意参与,我自己翻译一下,欢迎大家指正: 除另有规定外,取各品种项下规定量的供试品,加水溶解使成25ml(溶液如显碱性,可滴加硝酸使成中性),再加稀硝酸10ml;溶液如不澄清,应滤过;置50ml纳氏比色管中,加水使成约40ml,摇匀,即得供试溶液。 Test solution: unless otherwise specified, weigh specified quantity of test sample in the individual monograph, dissolve and dilute to 25ml with water (if the solution is alkaline, dropwise add nitric acid to neutral), add 10ml of dilute nitric acid, filter if the solution is not clear. Transfer this solution to a 50-ml nessler tube, dilute to 40ml with water, mix.