排序方式: 共有161条查询结果,搜索用时 187 毫秒
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微波辅助液液微萃取-气相色谱-质谱分析蔬菜、水果中的多种拟除虫菊酯残留 总被引:21,自引:0,他引:21
将微波辅助萃取同液液微萃取技术相结合,利用气相色谱-质谱分析技术,结合时间编程-选择离子检测模式,开发了一种简捷、实用、回收率高的蔬菜、水果中多种拟除虫菊酯残留的检测技术。该技术同当前执行的国标方法相比,有机溶剂用量少,操作简便,提取液无须严格净化便可进行GC/MS分析,大大提高了分析速度。经基体标准加入回收实验,除联苯菊酯外,其他9种菊酯的10ng/g的加样回收率均在75%以上,且在国标要求的最大残留限量附近有良好的线性关系,能满足当前蔬菜、水果中拟除虫菊酯残留的检测要求。 相似文献
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FTIR聚类分析结合差热分析法应用于中药材延胡索表征的研究 总被引:8,自引:0,他引:8
采用傅里叶变换红外光谱法(FTIR)对不同品种的大叶、小叶延胡索及非正品延胡索进行了直接测定,并用FTIR聚类分析并结合差热分析法(DTA)对延胡索正品的不同品种及与非正品的亲缘关系进行了研究。FTIR聚类分析结果显示5个样品分为4组,大叶、小叶延胡索为一组,齿瓣元胡、东北元胡和土元胡各为一组;差热分析结果显示正品延胡索品种与非正品延胡索的DTA曲线有很明显的区别。所提出方法可有效地鉴别亲缘关系相近的中药材植物。 相似文献
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傅里叶变换红外光谱定量分析法测定盐酸雷尼替丁含量 总被引:5,自引:0,他引:5
1 引 言盐酸雷尼替丁片剂的商品名为兰百幸 ,又名呋喃硝胺、甲硝呋胍及胃安太 ,其化学名为N′ 甲基 N [2 [[[5 [(二甲氨基 )甲基 ] 2 呋喃基 ] 甲基 ]硫代 ]乙基 ] 2 硝基 1,1 乙烯二胺盐酸盐。它是一种选择性的H2 受体拮抗剂 ,能有效地抑制组胺、五肽胃泌素及食物刺激后引起的胃酸分泌 ,降低胃酸和胃酶活性。对胃及十二指肠溃疡的疗效高 ,具有速效和长效的特点。常见的盐酸雷尼替丁片剂中盐酸雷尼替丁含量的测定方法一般采用加水溶解后再用分光光度计测定 ,也有报道采用电极法进行含量测定。以往由于仪器的限制 ,红外光谱基本上… 相似文献
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A Zinc(Ⅱ) complex [ZnCl2(HL)2] with Schiff base HL derived from rimantadine and salicylaldehyde was synthesized and characterized by elemental analysis, infrared spectra, 1H NMR spectra,molar conductance, ultraviolet and visible spectra, thermal analysis. Its structure was determined by single crystal X-ray diffraction method. The complex, C38H50Cl2N2O2Zn, crystallizes in the orthorhombic system, space group Aba2 with a=1.381 7(3), b=2.275 0(5), c=1.145 0(2) nm, V=3.599(1) nm3, Z=4, Mr=653.79, F(000)=1 496, Dc=1.301 kg·m-3, μ(Mo Kα)=0.866 mm-1. The kinetic parameters were obtained from the analysis of TG curve by integral methods. The functions of thermal decomposition reaction mechanism are: F(α)=[1-(1-α)1/3]2, and kinetic compensation effect equation lnA=0.019 1E-0.142 7. CCDC: 253297. 相似文献
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The new solid complexes [LnL2(NO3)2]NO3 (L=C18H23NO2, N-2-hydroxy-3-methoxy-benzaldehyde-1-aminoadamanantane, Ln=La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Y) of rare earth nitrates with Schiff base derived from o-vanillin and adamantaneamine have been synthesized in non-aqueous system and characterized by elemental analysis, molar conductance, infrared spectra, 1H NMR spectra, thermal analysis. The coordination modes of the bonding in these complexes were discussed and the possible structure were proposed. Every central Ln(Ⅲ) ion in the complexes coordinates with both two Schiff base ligands via four oxygen atoms of the phenol hydroxy groups and methoxy groups and two nitrates via their four oxygen atoms. Their coordination numbers are eight. In addition, the antibacterial activity of the Schiff base ligand and the complexes were studied. 相似文献