悬浮(乳化)液进样-火焰原子吸收光谱法测定聚合松香中锌

Determination of zinc in polymerized rosin by suspension and emulsification sampling-flame atomic absorption spectrometry

以表面活性剂OP溶液为样品润湿剂，以琼脂溶液为悬浮剂，用悬浮液技术将聚合松香样品制成悬浮液；或以乙醇为溶剂，用乳化剂OP溶液乳化成乳浊液。用乙二醇配制样品空白溶液．建立了悬浮液技术及乳化技术处理样品，快速测定聚合松香中锌的火焰原子吸收光谱（FAAS）法。试验表明，在悬浮液中加入适量盐酸可显著提高锌的吸光度，试液的物理性质与其空白溶液的一致，无背号吸收干扰。对悬浮液的稳定时间、乳化剂的选择、吸光度重复性及检出限进行了考察。测定结果的相对标准偏差小于或等于2．5％，加标回收率为97．1％～103．4％；测定结果与灰化法一致，相对误差小于或等于±1．8％。

Surfactant OP was used as a wetting agent of sample and agar solution was used as a suspending agent, and the suspension of polymerized rosin was prepared by suspension technique. Or the ethyl alcohol solution of sample was emulsified into emulsion by the emulsifier OP. Both flame atomic absorption spectrometric methods for rapid determination of zinc in polymerized rosin with suspension technique and emulsification technique have been established. The test indicates that the marked increase in absorbance of zinc was achieved by adding suitable amount of hydrochloric acid into the suspension, the physical property of test solution was identical with its blank solution and there was not background absorption interference. Stable time of the suspension, the selection of emulsifyer, repeatability of absorbance and detection limit were studied. RSDs of determination results were not more than 2.5 % . The recoveries were 97.1% - 103.4 % . The determination results of this method were consistent with those obtained by ashing method. The relative errors were not more than ±1.8 %.