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GC-MS法快速测定食品接触材料油墨中16种多环芳烃 总被引:1,自引:0,他引:1
以正己烷超声提取,弗罗里硅土固相萃取柱净化,以正己烷-二氯甲烷溶液(体积比1:1)洗脱,用GC-MS联用仪SIM模式外标法定量测定食品接触材料油墨中16种多环芳烃.在优化条件下,16种多环芳烃的浓度在0.1~4.0 μg/mL范围内与色谱峰面积呈良好的线性关系,线性相关系数大于0.995,检出限为0.12~3.24 ng/L.加标回收率为77.24%~ 104.76%,测定结果的相对标准偏差为1.05%~1.69%(n=6).该方法适用于食品接触材料油墨中PAHs的日常检测. 相似文献
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以硝酸作为消解液,采用湿消解-电感耦合等离子体发射光谱法(ICP-AES)测定药用胶囊中的铬含量.在0~80 ng/mL范围内,铬的浓度与发射光强度呈良好的线性关系,相关系数r=0.999 98,检出限为1.42 ng/mL.对3个浓度水平的铬标准溶液进行平行测定,测定结果的相对标准偏差为1.43%~1.79%(n=6),加标回收率为93.1% ~110.0%.该方法可以用于药用胶囊中铬的日常检测. 相似文献
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Highly efficient four-wave mixing induced by quantum constructive interference in rubidium vapour 下载免费PDF全文
We demonstrate efficient four-wave mixing with an intensity conversion efficiency of nearly 100% in theory without considering the Doppler-broadening effect in a four-level double-Λ system of hot 87 Rb gas.The corresponding experimental value of about 73% was reported in our earlier work under the same conditions.This dramatic efficiency is critically dependent on the constructive interference between two four-wave mixing processes relevant to the internally generated four-wave mixing signal. 相似文献
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