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本文利用743厂所产含氧化铕的氟化镧单晶片,自制氟离子选择电极作指示电极,测定磷矿中氟的含量。作了电极性能,H~+、Al~(+3)、Ca~(+2)、Mg~(+2)、Fe~(+3)、PO_4~(-3)、SiO_3~(-2)等七个离子的干扰实验。对于冷酸分解磷矿的条件进行了研究。采用冷无机酸分解矿样后,以柠檬酸钠作缓冲络合剂,用标准曲线法和标准加入法测定氟含量。操作简便,快速,灵敏度高,适用于能被酸分解的磷矿、磷肥中氟的测定。结果舆硝酸钍容量法一致。
In this paper, 743 factory produced containing europium oxide lanthanum fluoride single crystal, homemade fluoride ion selective electrode as the indicator electrode, determination of phosphate rock phosphate content. The electrode properties of H ~ +, Al ~ (+3), Ca ~ (+2), Mg ~ (+2), Fe ~ (+3), PO_4 ~ (-3), SiO_3 ~ Interference experiments such as seven ions. The conditions of cold acid decomposition of phosphate rock were studied. After the cold mineral acid was used to decompose the mineral sample, sodium citrate was used as buffer complexing agent, and the fluorine content was determined by standard curve method and standard addition method. Easy to operate, fast, high sensitivity, suitable for acid decomposition of phosphate rock, phosphate determination of fluorine. The result is consistent with the nitric acid thorium capacity method.