A¹¹⁶Cd–¹⁰⁶Cd double‐spike method in combination with thermal ionization mass spectrometry (TIMS) was applied to obtain cadmium (Cd) mass fractions and stable isotope compositions in seven biogenic certified reference materials (pine needles, tomato leaves, spinach leaves, lichen, mussel tissue, oyster tissue, and pig kidney). This sample set was supplemented by the analysis of two manganese nodules and one soil reference material for which the Cd isotopic data has already been reported. The intermediate measurement precision of the whole protocol as determined for the NIST SRM 3108 Cd standard solution yields an excellent value of δ^114/110Cd of −0.005 ± 0.029‰ (2SD, n = 47). The Cd isotopic compositions of the biogenic materials, reported as δ^114/110Cd relative to NIST SRM 3108, range from −0.52 to +0.50‰. Plants show δ^114/110Cd mean values ranging from −0.09 to +0.45‰ whereas the δ^114/110Cd value of −0.17‰ was detected in the lichen and the values of −0.51, −0.52, and +0.47‰ were gathered for the oyster, mussel, and pig kidney tissues, respectively. The observed large variation of the δ^114/110Cd values in the biogenic reference materials indicates a potential to use the natural mass-dependent Cd isotope fractionation in environmental, biogeochemical, and physiological studies.

阿¹¹⁶ CD- ¹⁰⁶镉双穗与热电离质谱（TIMS）组合方法用于获得在七个生物认证的参考材料镉（Cd）的质量分数和稳定同位素组合物（松针，番茄叶，菠菜叶，地衣，贻贝组织，牡蛎组织和猪肾）。通过分析两个锰结核和一种土壤参考物质（该物质已报告了Cd同位素数据）补充了该样品集。根据NIST SRM 3108 Cd标准溶液确定的整个协议的中间测量精度可产生出色的^δ114/110 Cd值为-0.005±0.029‰（2SD，n = 47）。生物成因材料中的Cd同位素组成，以δ表示相对于NIST SRM 3108的^114/110 Cd，范围为-0.52至+ 0.50‰。植物的^δ114/110 Cd平均值在-0.09至+ 0.45‰之间，而地衣中的^δ114/110 Cd值为-0.17‰，收集到的值为-0.51，-0.52和+ 0.47‰分别用于牡蛎，贻贝和猪肾组织。在生物参考物质中观察到的^δ114/110 Cd值的大变化表明，有可能在环境，生物地球化学和生理研究中使用依赖于自然质量的Cd同位素分级分离。