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目的:测定不同来源龙齿药材中铅(Pb)、镉(Cd)、汞(Hg)、砷(As)4种重金属的含量。方法:对龙齿样品进行湿法消解后,采用石墨炉原子吸收光谱法(GFAAS)测定龙齿样品中Pb、Cd、As含量,以1%磷酸二氢铵+0.06%硝酸镁作为基体改性剂,Pb、Cd、As的测定波长分别为283.3、228.8、193.7 nm,灯电流分别为10、8、130 m A,狭缝均为0.7 nm。以硼氢化钠作为还原剂的冷蒸气原子吸收光谱法(CVAAS)测定Hg含量,测定波长253.7 nm,灯电流140 m A,狭缝0.7 nm,延迟时间5 s。结果:Pb、Cd、Hg、As元素测定方法线性关系分别为Y=0.001 9X+0.008 8(r=0.999 0)、Y=0.025 3X+0.014 6(r=0.998 5)、Y=0.012 8X+0.001 6(r=0.999 7)、Y=13.01X+0.813 2(r=0.999 4),RSD均小于3%,回收率为90.7%~112.7%;含量测定结果分别为0.58~6.27、0.04~2.89、0.26~1.16、0.09~0.88 mg·kg-1。结论:不同来源的龙齿药材中4种重金属含量不同,其中Pb含量是4种重金属中最高的。经方法学验证,本法为制定龙齿重金属限度质量标准提供了参考。
Objective: To determine the contents of four heavy metals such as lead (Pb), cadmium (Cd), mercury (Hg) and arsenic (As) from different sources. Methods: After the tooth samples were digested by wet method, the content of Pb, Cd and As in the tooth samples were determined by graphite furnace atomic absorption spectrometry (GFAAS) and modified with 1% ammonium dihydrogen phosphate and 0.06% magnesium nitrate The determination wavelength of Pb, Cd and As were 283.3, 228.8 and 193.7 nm, the lamp currents were 10, 8 and 130 m A, respectively, and the slits were 0.7 nm. The Hg content was determined by cold vapor atomic absorption spectrometry (CVAAS) using sodium borohydride as the reducing agent. The wavelength was 253.7 nm, the lamp current was 140 m A, the slit was 0.7 nm and the delay time was 5 s. Results: The linear relationship of the determination methods of Pb, Cd, Hg and As were Y = 0.001 9X + 0.008 8 (r = 0.999 0), Y = 0.025 3X + 0.014 6 (r = 0.998 5) The RSDs were all less than 3% and the recoveries were 90.7% ~ 112.7%, respectively. The determination results were 0.58 ~ 6.27, 0.04 ~ 2.89, 0.26 ~ 1.16,0.09 ~ 0.88 mg · kg-1. Conclusion: The content of four kinds of heavy metals in different materials is different, and the content of Pb is the highest among the four kinds of heavy metals. The methodological verification, the law for the development of long tooth heavy metal limit quality standards provide a reference.