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| 折扣與優(yōu)惠：團(tuán)購最低可5折優(yōu)惠 - 了解詳情 | 論文格式：Word格式(*.doc) |  |
摘要:本論文采用HNO3：H2O2為1:1作為消解試劑，以高壓消解法消解樣品，以載流溶液鹽酸酸度、還原劑KBH4濃度、負(fù)高壓為正交試驗因素，選三水平做正交試驗，在正交試驗的優(yōu)化條件下，得出實驗最優(yōu)條件為5%的鹽酸、負(fù)高壓為270V、KBH4濃度為20g/L；根據(jù)實驗優(yōu)化條件，繪制砷、汞標(biāo)準(zhǔn)曲線，砷的相關(guān)系數(shù)為R=0.9993，汞的相關(guān)系數(shù)為R=0.9997，并以5%的鹽酸做載流液，加入10g/L硫脲做預(yù)還原掩蔽劑，20g/LKBH4為還原劑，用原子熒光法測定云黃連中砷的含量為0.1347mg/kg，汞的含量為0.0112mg/kg。該方法測得的回收率為94%-100.5%之間，砷的檢出限為0.0691µg/L，汞的檢出限為0.0253µg/L。 關(guān)鍵詞：黃連；砷；汞；原子熒光光譜法
ABSTRACT:This paper adopted HNO3:H2O2 1:1 as negate reagents, with High-pressure digestion method digested samples, In current-carrying solution acidity, reductant concentration of hydrochloric acid KBH4 and negative high-pressure for orthogonal experiment factors, Chosen three levels for orthogonal experiment, In the optimized conditions of orthogonal test, Obtain the optimal conditions for 5% of hydrochloric acid, negative high pressure for 270V, KBH4 concentration for 20g/L, According to the experimental optimized conditions , Drawn arsenic and mercury standard curve，Arsenic and the correlation coefficient was R = 0.9993, Mercury and the correlation coefficient was R = 0.9997,And hydrochloric acid at 5% current-carrying liquid, Joined in 10g/L thiourea masking agent for prereduction,20g/L KBH4 masking agent for reductant, By atomic fluorescence spectrometry cloud the content of arsenic coptis chinensis for 0.1347 mg/kg, mercury content was 0.0112 mg/kg. This method for measurement of the recovery 100.5% between, arsenic 94 percent - the detect limited for 0.0691 µg/L, mercury detect limit for 0.0253 µg/L. Keywords: Coptis, Arsenic , Mercury, Atomic fluorescence spectrometry. |
