火焰原子吸收光谱法快速测定黄瓜中的钙和锌

Determination of calcium and zinc in cucumber by flame atomic absorption spectrometry.

采用悬浮液法和非完全消化法分别对黄瓜样品进行处理,建立了悬浮液法和非完全消化法-火焰原子吸收光谱法快速测定黄瓜中钙和锌的分析方法,以La3+作为钙的释放剂来消除化学干扰。实验表明,在悬浮液中加入适量盐酸可显著提高被测元素的吸光度,试液的物理性质与空白溶液的一致,无背景吸收干扰。测定结果的相对标准偏差小于0.9%,测定结果与灰化法一致,相对误差小于±0.7%。说明,采用火焰原子吸收光谱法,以悬浮液法或非完全消化法取代灰化法来处理黄瓜样品是可行的。

A flame atomic absorption spectrometry （FAAS） method has been developed for rapid determination of calcium and zinc in cucumber with two sample pretreatment techniques （suspension solution method and noncomplete digestion method. ）. La^3＋ was used as calcium releasing agent to eliminate chemical interference. The results indicate that adding suitable amount of hydrochloric acid in suspension solution can increase the absorbance of tested element markedly. The physical properties of test solution is identical with blank solution and there is no background absorption interference. The RSDs were less than 0.9%. The results of this method were consistent with ashing method and the relative errors between the two methods were less than ±0.7%. In FAAS, displacement digestion methods is possible. of ashing method by suspension solution and noncomplete digestion methods is possible.