食品防腐剂丙酸钙中微量元素铬的测定

Trace Cr Determination in Food Preservation

测定用鸡蛋壳制作的食品防腐剂———丙酸钙中痕量铬并对其可信度进行证明。采用化学发光法和石墨炉原子吸收法进行测定并比较其结果。两种方法均可达到快速、简便、干扰小、重现性好,均可达到生产中检测的要求。化学发光法的最低检出限为1.5×10-12g/ml,Cr3+在1×10-10～1×10-6g/ml浓度范围内与发光强度呈较好的线性关系。采用石墨炉原子吸收体系检测,最低检出限为1×10-12g/ml,标准曲线范围为0～1×10-6g/ml。

To determine trace chromium in food preservative calcium propionate made of eggshell to prove it's reliability,we adopted chemiluminescence method and graphite furnace atomic absorption spectrometric (GFAAS)method to compare the obtained results. It was showed that results of the two methods were rapid simple,little interference and fine reproducibility. By chemiluminescence method the detection limit was1.5×10-12g/ml and the linear range 1×10-10～1×10-6g/ml. By GFAAS the same results were 1×10-12g/ml and 0～1×10-6g/ml respectively.