灰化消解-极谱法测定油料中五个重金属元素

Polarographic Determination of 5 Heavy Metals in Oil with Ashing Digestion of Sample

摘要: 建立了灰化消解-极谱法测定油样中镉、铅、铜、镍、钴等5种微量重金属元素的含量.油料样品通过灰化法消解后,用极谱法在乙酸-乙酸盐缓冲溶液和磺基水杨酸-磷酸-氨水体系中测定5种重金属元素的含量.5种微量重金属元素的检出限为1.3×10-4~9.8×10-4g·L-1,加标回收率为90%~106%,相对标准偏差为0.22%~3.16%.

Abstract: Five heavy metals,i.e.,cadmium,lead,copper,nickel and cobalt,were determined by polarography.The oil sample was pretreated by burning,ashing and finally igniting at 600 ℃.Cadmium(Ⅱ),lead(Ⅱ) and copper(Ⅱ) were determined in an acetate buffer of pH 4.6 and nickel(Ⅱ) as well as cobalt(Ⅱ) were determined in an ammoniacal solution of pH 9.5 containing phosphate and sulfosalicylate.Detection limits of the 5 elements were in range of 1.3×10-4-9.8×10-4g·L-1.Their values of RSD′s were found in the range of 0.22%-3.16%,and values of recovery were in the range of 90%-106%.