Bourgoin B P, Boomer D, Powell M J, Willie S, Edgar D, Evans D
Environmental and Resource Studies Program, Trent University, Peterborough, Canada.
Analyst. 1992 Jan;117(1):19-22. doi: 10.1039/an9921700019.
Three brands of Ca supplement, a laboratory-reagent grade CaCO3 and a certified reference material (International Atomic Energy Agency H-5 Animal Bone) wee analysed for Cd and Pb by four different analytical techniques, viz., anodic stripping voltammetry inductively coupled plasma mass spectrometry, flame atomic absorption spectrometry and electrothermal atomic absorption spectrometry. The Pb levels measured by the four techniques in the bone powder were within the certified Pb level in this certified reference material. Similarly, no significant differences [p less than 0.05; analysis of variance (ANOVA)] were observed in samples with Pb concentrations greater than 1 microgram g-1. However, the Pb levels in the laboratory-reagent grade CaCO3 obtained by flame atomic absorption spectrometry (0.79 micrograms g-1) averaged about three times higher than those measured by the other three techniques (i.e., 0.25 micrograms g-1). Although no significant differences (p less than 0.05; ANOVA) in Cd levels were observed within any of the samples (intra-sample variability), the Cd concentration measured in the different Ca supplements (inter-sample variability) varied by three orders of magnitude (ranging from 0.07 to 3.59 micrograms g-1).
采用四种不同的分析技术，即阳极溶出伏安法、电感耦合等离子体质谱法、火焰原子吸收光谱法和电热原子吸收光谱法，对三种钙补充剂品牌、一种实验室试剂级碳酸钙和一种有证标准物质（国际原子能机构H-5动物骨）进行了镉和铅的分析。通过这四种技术测得的骨粉中的铅含量在该有证标准物质的铅认证水平范围内。同样，在铅浓度大于1微克/克的样品中未观察到显著差异[p小于0.05；方差分析（ANOVA）]。然而，通过火焰原子吸收光谱法测得的实验室试剂级碳酸钙中的铅含量（0.79微克/克）平均比其他三种技术测得的铅含量（即0.25微克/克）高出约三倍。尽管在任何样品中（样品内变异性）镉含量均未观察到显著差异（p小于0.05；ANOVA），但不同钙补充剂中测得的镉浓度（样品间变异性）相差三个数量级（范围为0.07至3.59微克/克）。
