盐度滴定法.doc

Test Method Subject Specification No. SALT, TITRATION METHOD HS039 盐，滴定法 Location Revision No. HUMBOLDT 01 Nature Of Revision Issue Date General Revision. 3/30/84 Approval Supersedes issue of 7/15/81. I. DEFINITION 1、 定义： This procedure describes the analysis of sodium chloride using silver nitrate reagent for precipitation of the chloride as the silver salt. 该程序描述了用硝酸银分析滴定氯化钠含量。 SCOPE 2、 范围 Applicable to J. Hungerford Smith products and other food products having varying amounts of sodium chloride and having little or no other chloride containing salts. 适用于汉斯所有添加氯化钠以及其他少量含盐的产品。 III. APPARATUS AND REAGENTS 3、 仪器和药品 A. Fisher Accumet pH Meter, equipped with a reference calomel electrode, and a silver electrode (billet), and an automatic temperature compensator, or equivalent. pH计，配有甘汞电极、银电极并自带温度补偿。 B. Buret, 25 ml, 0.10 ml subdivisions, Teflon stopcock, Automatic, VWR #17550-083 or equivalent. 滴定管，25ml，精度0.10ml，塑料活塞、自动，VWR #17550-083或等同设备。 C. Balance, 160 g capacity, readable to .01g Mettler PN163 #11275-215 or equivalent. 天平，量程160g，精确到0.01g梅特勒PN163 #11275-215或等同设备。 D. Beakers, 500 ml, graduated, VWR #13910-201 or equivalent. 烧杯，500ml，graduated, VWR #13910-201或等同设备。 E. Flasks, volumetric, 1000 ml; VWR #29619-610 and -653 or equivalent. 量筒，1000 ml; VWR #29619-610 and -653或等同设备。 F. Magnetic stirrer, VWR #58939-909 or equivalent. 磁力搅拌器，VWR #58939-909或等同设备。 G. Stirring bats, 1 length, Teflon coated, VWR #58948-138 or equivalent. 1长附塑料套的磁粒，VWR #58948-138或等同设备。 H. Bottle, Aspirator (silver nitrate reagent reservoir), or equivalent. 储液瓶（存放硝酸银）或等同设备。 NOTE: If available, an amber bottle should he used; otherwise the bottle should be- painted black or covered to exclude light. 注意：如果有条件，可用棕色瓶；其他瓶子应涂黑或避光。 I. Silver nitrate crystals, reagent grade, JTB #3426 or the equivalent. 硝酸银，分析纯，JTB #3426或等同。 J. Standard Salt Buffer solution, reagent gr