摘要
目的研究示波极谱连续测定食品水质中微量锌、锰、铜、铅.方法选用氨基乙酸-氯化钾-硫氰酸钾-盐酸作为底液,在该底液体系中4种微量元素在峰电位为-1.26 V、-1.55 V、-0.42 V、-0.29(VS.SCE)处产生稳定的络合吸附二阶导数极谱波,空白无峰出现.结果锌、锰、铜的检出限为0.01 mg/kg(L),铅检出限为0.02 mg/kg(L).锌、锰、铜浓度在0.01～0.8μg/g(ml)范围内与峰电流成正比,铅浓度在0.02～0.6μg/g(ml)范围内与峰电流成正比,r=0.998 3～0.9997.样品回收率96.6%～99.3%,RSD 1.3%～6.8%.结论该方法灵敏、准确、易于操作,可用于食品及水样中4种微量元素的连续测定.
Objective To study the continuous oscillopolarographic detection of microelements of zinc, manganese, copper and lead in foodstuff and water. Methods In a base solution of Amino - acetic acid - KCL - KSCN-HCL, a stable, adsorptive, second derivate polarographic wave of zinc, manganese, copper and lead was observed at - 1.26 V, - 1.55 V, -0.42 V and -0.29 V （vsSCE）, respectively. Results The detection limit of zinc, manganese and copper was 0.01 mg/kg（L）, which of lead was 0.02 mg/kg（L）. Direct linear relationship between the peak currents of 2nd derivate polarographic wave and the concentra- tions of zinc, manganese and copper was found in the concentration range of 0.01 -0.8 μg/g（ml）, lead 0.02-0.6μg/g（ml）, r = 0.998 3- 0.999 7. The sample recovery rates were from 96.6% to 99.3%, RSD were from 1.3% to 6.8%. Conclusions The method is sensitive, accurate and easy to be operated and can be applied to the continuous detection of zinc, manganese, copper and lead in foodstuff and water.
出处
《职业卫生与病伤》
2005年第3期181-182,共2页
Occupational Health and Damage
关键词
食品
水
示波极谱连续测定法
锌
锰
铜
铅
Foodstuff
Water
Continuous oscillopolarographic detection
Zinc
Manganese
Copper
Lead
