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目的建立应用测汞仪直接测定野生食用菌中总汞含量的测定方法。方法样品经均质器粉碎,称量后,直接进样。样品在催化管内加热分解,在氧气的作用下,汞在齐化管内与金粉反应被捕集下来,形成金汞齐,再经高温使金汞齐分解成汞原子蒸气经载气带入吸收池,在253.7 nm处进行吸收测定。结果测汞仪检测方法线性范围:0.0~1000 ng/L,检出限为0.005 ng/m L,相关系数(R2)优于0.999,相对标准偏差(RSD)小于1.5%,回收率大于99%。结论用此仪器检测的方法无需进行样品前处理、进样量少、方法灵敏度高、精密度好、结果准确可靠、操作简单快速、没有试剂污染、检测速度快和运行成本不高,适用于野生食用菌中总汞的测定。
Objective To establish a method for the direct determination of total mercury in wild edible mushrooms by mercury analyzer. Methods Samples were homogenized crushed, weighed, direct injection. The sample is heated and decomposed in the catalytic tube. Under the action of oxygen, mercury is trapped in the homogeneous tube to react with the gold powder to form gold amalgam, and then the gold amalgam is decomposed into mercury atom by the high temperature. The vapor is carried by the carrier gas into the absorption cell , Absorbance was measured at 253.7 nm. Results The linear range of the mercury detection method was 0.0-1000 ng / L, the detection limit was 0.005 ng / m L, the correlation coefficient (R2) was better than 0.999, the relative standard deviation (RSD) was less than 1.5% and the recovery was more than 99% . Conclusion The method of this instrument does not require sample pretreatment, the sample volume is less, the method has high sensitivity, good precision, accurate and reliable results, simple and fast operation, no reagent contamination, high detection speed and low running cost, suitable for wild Determination of total mercury in edible mushrooms.