CAJ | 학술논문

以巯基修饰磁性纳米材料 Fe3 O4@ SiO2-SH 为固相萃取吸附剂从花蛤样品中富集痕量的甲基汞,2．0 mol/L HCl溶液为洗脱液,KBrO3和KBr的混合溶液为消解液,用原子荧光分光光度计测定.研究了影响甲基汞富集和测定的因素,包括溶液的pH值、吸附剂的用量、吸附时间等.利用标准曲线法定量.工作曲线在1．0~40ng/L的范围内线性关系良好,相关系数为 r=0．9997,相对标准偏差为1．6%(n =11),检出限为0．2 ng/L,回收率为95%~100%,显示了较高的灵敏度和精密度.
이구기수식자성납미재료 Fe3 O4@ SiO2-SH 위고상췌취흡부제종화합양품중부집흔량적갑기홍,2．0 mol/L HCl용액위세탈액,KBrO3화KBr적혼합용액위소해액,용원자형광분광광도계측정.연구료영향갑기홍부집화측정적인소,포괄용액적pH치、흡부제적용량、흡부시간등.이용표준곡선법정량.공작곡선재1．0~40ng/L적범위내선성관계량호,상관계수위 r=0．9997,상대표준편차위1．6%(n =11),검출한위0．2 ng/L,회수솔위95%~100%,현시료교고적령민도화정밀도.
Fe3 O4@SiO2-SH magnetic nanomaterials was applied as solid phase extraction sorbent for enrich-ment of trace methylmercury from Ruditapes philippinarum samples. HCl solution (2. 0mol/L) was used as eluent,and a mixture of KBrO3 and KBr as digestion solution. The concentration of Hg2+ in digestion solution was determined with an atomic fluorescence spectrophotometer. To study the factors that affected the enrichment and determination of methylmercury,the conditions including solution pH,amount of sorbent,and equilibrium time were optimized. The standard curve in the range of 1. 0 ~40. 0 ng/L showed good linearity with correlation coefficient over 0 . 999 . The recoveries of spiked sample ranged from 95% to 100%. Relative standard deviation was 1. 6% after 11 times of repeat measurement,and the detection limit was 0. 2 ng/L. This method for methylmercury determination in Ruditapes philippinarum samples exhibited high sensitivity and pre-cision.