消解氨溶-火焰原子吸收光谱法测定胶乳中钠

Determination of sodium in rubber latex by flame atomic absorption spectrometry with digestion-ammonia dissolution

用消解氨溶法处理胶乳样品 ,即先用浓硝酸消解样品 ,再用氨水溶解消解产物 ,建立了在氨性溶液中快速测定胶乳中钠的FAAS法。以硝酸钾溶液作为消电离剂 ,用工作曲线法测定。对样品处理方法、消解产物的溶解性质、线性范围、干扰及检出限进行了考察。测定结果的相对标准偏差 1 7% ,加标回收率 97 3 %～ 10 2 3 %。方法简便、快速、准确。

The sample of rubber latex was treated by the digestion-ammonia dissolution method,that is ,the digestion of sample with concentrated nitric acid and then to dissolve the digested product of sample in stronger ammonia water.A FAAS analytical method for rapid determination of sodium for rubber latex in ammonia solution had been developed.the solution of KNO 3 was served as the deionization agent.The working curve method was used to determine.The pretreatment method of rubber latex sample,the dissolubility of the digested product,linearity range,interferences and the detection limit were studied.The relative standard deviation is 1.7%.The recoveries are 97.3%-102.3%.This method is convenient,rapid and accurate.