消解乳化-火焰原子吸收光谱法测定胶乳中镁和锌

用消解 乳化法处理胶乳样品 ,即先用浓硝酸消解样品 ,以乙醇 甲基异丁基酮混合溶剂溶解消解产物 ,然后用乳化剂Tween -80乳化成乳浊液。建立了快速测定胶乳中镁、锌的FAAS法。以工作曲线法测定。对样品处理方法、消解产物的溶解性质、乳化剂的选择、试液与空白溶液粘度的一致性、线性范围、干扰及检出限进行了考察。测定结果与灰化法一致 ,相对标准偏差小于 3.2 % ,镁、锌的加标回收率分别为 95.85 %～ 10 0 .0 %和 99.0 %～ 10 3. 0 %。方法简便

FAAS determination of magnesium and zinc in rubber latex by digestion-emulsification method

Treat sample of rubber latex with the digestion emulsification method,that is,the digestion of sample with concentrated nitric acid and to dissolve the digested product of sample in mixed solvent of ethyl alcohol methyl isobutyl ketone,and then the alcohol ketone solution of digested product was emulsified into emulsion with emulsifier Tween 80 A FAAS analytical method for rapid determination of magnesium and zinc in rubber latex had been developed The working curve method was used to determine The pretreatment method of rubber latex sample,the dissolubility of the digested product,choices of emulsifier,identity of viscosity for test solution and for blank solution,linearity range,interference and the detection limit etc. were studied The determination results were consistent with those obtained by ashing method The relative standard deviations were less than 3 2% The recoveries were 95 8%-100 0% for magnesium and 99 0%-103 0% for zinc This method is convenient,and easy to operate