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目前测定磷酸盐一般都采用磷钼兰法;用氯化亚锡作还原剂。伹单用氯化亚锡作还原剂,缺点很多,氯化亚锡用量如有多少,发色的深淺就不一样;比色时时間越久,颜色就越深。另外,如果酸度控制得不当,往往生成假颜色或减色等现象。由于上述原因,往往不易获得正确的結果,同时每測定一次样品,还必須配制一次标准系列,很不方便。我們认为,設法控制氯化亚鍚的稳定性,可以得到稳定的颜色。根据实验证明,用酒石酸溶液可以达到稳定氯化亚錫的目的,使顏色稳定。在每5毫升体积此色溶液中,可用1毫升刻度吸管正确加入一滴1％酒石酸溶液,酒石
The current determination of phosphate are generally used Molybdenum law; with stannous chloride as a reducing agent.伹 single use of stannous chloride as a reducing agent, many shortcomings, such as the amount of stannous chloride, hair color is not the same; color longer, the deeper the color. In addition, if the acidity is not properly controlled, false color or color reduction often occurs. Due to the above reasons, it is often not easy to get the correct result. At the same time, every time a sample is measured, it is very inconvenient to prepare a standard series. In our opinion, trying to control the stability of acrid chloride can achieve a stable color. According to experimental evidence, with tartaric acid solution can achieve the purpose of stabilizing stannous chloride, the color stability. In every 5 ml volume of this color solution, a drop of 1% tartaric acid solution can be used 1 ml graduated pipette, tartar