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目前.我国在食品安全检测方面针对目的国对出口产品采取了严格的检测措施,但是我国产品在国外(如日本、欧盟和美国等)仍常被检出农药残留物、重金属、抗生素超标等,造成了出口贸易中的被动和极大的经济损失。究其原因,最关键的技术问题就是我们所采用的相应的检测测量标准(标准物质在化学物质检测测量中就是测量标准)的量值得不到保证。这是我们迫切需要解决的难题。由于国内目前已有的具有可靠溯源性的标准物质和工作参考物质远不能满足校准仪器、测试方法和进行检测过程的质量监控的需要,[第一段] 相似文献
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A sensitive liquid chromatography tandem mass spectrometry method with isotopic label d5-chlormphenicol as internal standard was developed to determine trace amounts of chloramphenicol residue in pork. The pork powder were extract for 4 times by adding 10 mL 0.1 mol sodium acetate buffer solution (pH=5) and 20 mL ethyl acetate. Oasis solid-phase extraction and liquid-liquid partitioning were used to clean the aqueous solutions. The limits of detection (LOD) is 0.004 ng·g-1, and the limits of quantification (LOQ) is 0.02 ng·g-1.The linear range is between 0.01 ng·g-1 and 0.5 ng·g-1.The average recoveries are in the range of 99%—109% with the relative standard deviation less than 1.5%. 相似文献
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Progesterone is one of the most important gonadal hormone in human beings because it is very meaningful to maintain female physiological characteristics and normal physiologic function. Serum progesterone assays are ordinary analysis in clinical laboratory which is required high accuracy. Since the concentration of serum progesterone is in a very low level, immunoassays are routinely used to measure progesterone in clinical practice. The results of these methods are not intrinsically reliable which can in part be explained by cross-reactivity, reagent and so on. To solve these problems, we should establish a reference system of serum progesterone analysis. Two reference measurements procedure had been developed which based on isotope dilution gas chromatography-mass spectrometry. To develop our country’s serum progesterone reference system is an important task for us. 相似文献
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Rapid detection of trace amount of TNT on various surfaces was demonstrated using desorption electrospray ionization mass spectrometry without sample pretreatment. Under optimized working condition, the limit of detection was found around 0.1-10 fg as total amount, and the time consumed for single sample analysis was about 1.5 s. 相似文献
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