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测定过磷酸钙有效磷的方法,我国部颁标准法是用水和微碱性柠檬酸铵分别多次提取其水溶性磷和枸溶性磷,然后合并两浸出液,用磷钼酸喹啉重量法测定有效磷总量。有些单位常采用2%柠檬酸一次提取的钒钼黄比色快速测定方法。前者(简称标唯法——下同)试剂配制手续较繁,操作费时,成本也高。实用中,除磷肥厂评价产品等级或采购单位对肥料进行仲裁分析采用外,一般多不取此法。后者(简称快速法——下同)操作简便快速,但由于部分水溶性磷在提取过程中与某些阳离子发生次生反应而使测定结果偏低。栖试验的目的是初步探讨对快速法的改进,以便能达到同标准法相一致的测定结果。
Determination of the available phosphate superphosphate method, our ministerial standard method is to use water and slightly alkaline ammonium citrate, respectively, to extract its water-soluble phosphorus and citric acid soluble phosphorus, and then the two leachate, with quinoline phosphomolybdate gravimetric method Total available phosphorus. Some units often use 2% citric acid once extracted vanadium molybdenum yellow color rapid determination method. The former (referred to as the only method - the same below) reagent preparation procedures more complex, time-consuming operation, the cost is high. Practical, in addition to phosphate fertilizer plant product rating or procurement unit for arbitration of fertilizer used in analysis, the general do not take this method. The latter (referred to as the fast method - the same below) is simple and fast operation, but due to some water-soluble phosphorus in the extraction process with some of the cations secondary reaction and the determination results are low. The purpose of habitat testing is to initially explore the improvement of the rapid method so as to achieve the same result as the standard method.