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未被污染的海水含Cd 约0.03μgl~(1-),而基体含盐份3.5%左右,对使用石墨炉原子吸收法(GFAAS)直接测定海水Cd 带来极大困难.Slavin 采用NH_4H_2PO_4—Mg(NO_3)_2作基体改进剂和塞曼校正背景技术直接测定海水Cd,检出限为0.3ugl~(-1).Guevremont 用EDTA 作为海水Cd 的基体改进剂.继后又研究了几种有机基体改进剂(OMM)对Cd 测定的影响,表明OMM 具有降低背景和空白值较低的优点.
Uncontaminated seawater containing about 0.03μgl ~ (-1) of Cd and about 3.5% of salt content in the matrix have great difficulties in direct determination of seawater Cd by graphite furnace atomic absorption spectrometry (GFAAS) .Slavin uses NH_4H_2PO_4-Mg (NO_3) _2 as a matrix modifier and Zeeman correction Background Direct determination of seawater Cd, the detection limit of 0.3ugl -1 .Guevremont with EDTA as seawater Cd matrix modifier .Secondly, several organic The effect of matrix modifier (OMM) on Cd determination shows that OMM has the advantage of lower background and lower blank value.