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本文介绍格氏外推法在标准连续添加滴定中的应用。应用时即使被测离子浓度低至电极线性范围外,只要加入标准液后最后几点呈直线,本法仍可应用。利用此法,称取0.1克样品,在100毫升溶液中测定,可测到0.0xppm的氟,结果良好。一、实验部分 (一)试剂 5微克/毫升氟的标准液:由100微克/毫升氟的标准液配成,溶液中含有0.15M柠檬酸钠和0.1M硝酸钾。
This article describes the use of extrapolation of the standard continuous addition titration in the standard. Application Even if the measured ion concentration as low as the linear range of the electrode, as long as the last few points after adding standard solution was a straight line, the law can still be applied. Using this method, weighed 0.1 g of sample, measured in 100 ml of solution, measured 0.0xppm of fluorine, the result is good. First, the experimental part (A) Reagent 5 micrograms / ml of fluorine standard solution: 100 micrograms / ml of fluoride prepared by the standard solution containing 0.15M sodium citrate and 0.1M potassium nitrate.