快速测定聚磷酸钙镁肥料中的聚合态磷  

Rapid Determination of Polymerized Phosphorus in Calcium Magnesium Polyphosphate Fertilizer

作　　者：王伯通 胡兆平 于南树 WANG Botong;HU Zhaoping;YU Nanshu(Kingenta Ecdogical Engineering Group Co.,Ltd.,Linyi,Shandong 276000,China;State Key Laboratory of Nutrition Resources Integrated Utilization,Linyi,Shandong 276000,China;National Engineering&Technology Research Center for Slow and Controlled Release Fertilizers,Linyi,Shandong 276000,China)

机构地区：[1]金正大生态工程集团股份有限公司,山东临沂276000 [2]养分资源高效开发与综合利用国家重点实验室,山东临沂276000 [3]国家缓控释肥工程技术研究中心,山东临沂276000

出　　处：《肥料与健康》2020年第3期70-73,共4页Fertilizer & Health

基　　金：国家重点研发计划(2017YFD0200700)。

摘　　要：提出了一种间接快速测定聚磷酸钙镁肥料中聚合态磷含量的方法。用EDTA二钠盐溶液提取聚磷酸钙镁肥料中的聚合态磷,用5mol/L氢氧化钠溶液调节样品溶液的pH为12.0~12.5,煮沸15min使样品溶解。采用磷钼酸喹啉重量法测定有效磷含量,采用磷钒钼黄比色法测定正磷酸盐含量,有效磷和正磷酸盐含量的差值即为聚合态磷的含量。试验结果表明,在4种浓度水平下的样品加标回收率为98.43%~104.40%,相对标准偏差小于4%。该方法具有准确度高、重现性好等特点。A method for indirect and rapid determination of polymerized phosphorus in calcium magnesium polyphosphate fertilizer is proposed.EDTA disodium salt solution is used to extract the polymerized phosphorus in calcium magnesium polyphosphate fertilizer,and the pH of the sample solution is adjusted to 12.0 to 12.5 with 5 mol/L sodium hydroxide solution,and the sample is dissolved by boiling for 15 minutes.The quinoline phosphomolybdate gravimetric method is used to determine the content of available phosphorus,and the phosphorus vanadium molybdata yellow colorimetric method is used to determine the content of orthophosphate.The difference between the content of available phosphorus and orthophosphate is the content of polymerized phosphorus.The test results show that the recoveries of samples at 4 concentration levels range from 98.43%to 104.40%,and the relative standard deviation is less than 4%.This method has the characteristics of high accuracy and good reproducibility.

关 键 词：聚磷酸钙镁 间接法 聚合态磷 磷钼酸喹啉重量法 磷钒钼黄比色法 

分 类 号：O657.32[理学—分析化学]