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为建立电感耦合等离子体质谱法(ICP-MS法)测定美白祛斑类化妆品中汞、砷、铅、镉、铬5种元素含量的方法,将样品经硝酸和过氧化氢微波消解后,用电感耦合等离子体质谱仪测定美白祛斑类化妆品中重金属汞、砷、铅、镉、铬的含量。结果发现:汞、砷、铅、镉、铬混合标准溶液在0~100 ng/mL范围内线性关系良好,相关系数为0.9998~1.0000,各元素最低检出浓度均小于0.1 mg/kg,各元素加标回收率在97. 5%~108. 6%之间。该方法简便、灵敏,有较低的检出限,符合方法学验证要求,可用于美白祛斑类化妆品中汞、砷、铅、镉、铬的同时测定。 相似文献
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《化工之友》2008,(23)
目的测定牛耳枫、三叉苦、胆木、青牛胆、山苦茶五种药材中重金属元素含量。方法采用石墨炉原子吸收光谱法测定五种药材中铜、铅镉含量,用氢化物原子荧光法测定其中的砷、汞含量。结果牛耳枫中5种重金属元素(铜、镉、铅、汞及砷)含量分别为6.700,0.080,3.000,0.052,0.690mg/kg;三叉苦中5种重金属元素(铜、镉、铅、汞及砷)含量分别为4.300,0.040,1.600,0.040,0.820mg/kg;胆木中5种重金属元素(铜、镉、铅、汞及砷)含量分别为2.700,0.020,1.250,0.038,0.400mg/kg;青牛胆中5种重金属元素(铜、镉、铅、汞及砷)含量分别为5.000,0.120,0.690,0.050,0.620mg/kg;山苦茶中5种重金属元素(铜、镉、铅、汞及砷)含量分别为4.400,0.075,0.520,0.044,0.480mg/kg。结论5种药材重金属含量均符合药用植物及制剂的外经贸绿色行业标准。 相似文献
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对肥料中重金属元素含量测定的研究 总被引:1,自引:0,他引:1
介绍《肥料中砷、镉、铅、铬、汞限量》国家标准制定的目的意义、技术要求和试验方法 ,并将砷含量测定采用二乙基二硫代氨基甲酸银分光光度法或砷斑法 ,镉、铅、铬、汞含量的测定采用原子吸收分光光度法作为测定肥料中重金属元素的推荐方法 相似文献
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在黄河三门峡段采集了表层沉积物样品,采用ICP-MS测定了沉积物中重金属元素铬、锰、镍、铜、砷、镉、铅、铜的含量。结果表明,各元素含量在0.05~900mg/kg,锰的含量最高,汞的含量最低。铬、铜、铅和汞的含量均满足国标规定的土壤环境质量二级标准,镍、砷和镉的含量满足三级标准。 相似文献
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《国际聚合物材料杂志》2012,61(6):497-509
Glass fiber reinforced composites based on thermosets are the traditional materials used for many applications due to their good mechanical properties. The non-recyclability of these materials has led to the necessity to develop thermoplastic composites and industrial processes for their manufacture [1]. The present paper deals with the preparation of thermoplastic pre-pregs unidirectionally reinforced with Twarn® and their mechanical characterization. 相似文献
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采用DUO-ICP-AES同时测定精对苯二甲酸中钴、铬、铁、锰、钼、镍、钛,并对仪器的分析线选择、背景校正、入射功率、雾化器压力、辅助气流量、冷却气流量、蠕动泵转速的影响及共存元素的干扰、硝酸铯灰化助剂等因素进行了详细的研究。方法的检测限:钴0.0097 mg/L;铬0.0021 mg/L;铁0.0078 mg/L;锰0.0012 mg/L;钼0.0027 mg/L;镍0.016 mg/L;钛0.0027 mg/L,回收率和精密度分别为93.0%~99.5%和0.37%~3.2%。该方法快速简便,具有良好的精密度和准确度,适用于进出口精对苯二甲酸的日常检验。 相似文献
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The development of new methods for preparing polyfunctional organometallics has made a broad range of such reagents available for various transition metal-catalyzed cross-couplings. An overview of the most general preparation methods will be presented. Applications to practical cross-coupling procedures will be covered, emphasizing the functional group compatibility and the reaction scope. 相似文献
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本文研究了Arizona Chemical公司生产的胎面增强助剂(Tread Enhancement Additive-TEA)Sylvatraxx 4401对半钢子午线轮胎胎面胶性能的影响。结果表明:Sylvatraxx 4401的加入有利于提高白炭黑的分散性,改善混炼胶的加工性能和硫化胶的物理机械性能,能够明显提高胎面的抗湿滑性。随着Sylvatraxx 4401用量的增加,白炭黑在胶料中的分散进一步提高,混炼胶的门尼粘度降低;硫化胶的压缩生热和阿克隆磨耗降低,0oC的tanδ明显提高的同时60oC的tanδ略微降低,有利于胎面胶抗湿滑性能的提高和滚动阻力、动态生热的降低。 相似文献
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Mailadil T. Sebastian Sam Solomon Ravindran Ratheesh Jacob George Pezholil Mohanan 《Journal of the American Ceramic Society》2001,84(7):1487-1489
Microwave ceramic dielectric resonators (DRs) based on RETiNbO6 (RE = Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Y, and Yb) have been prepared using the conventional solid-state ceramic route. The DR samples are characterized using XRD and SEM methods. The microwave dielectric properties are measured using resonant methods and a net work analyzer. The ceramics based on Ce, Pr, Nd, and Sm have dielectric constants in the range 32–54 and positive coefficient of thermal variation of resonant frequency (τf ). The ceramics based on Gd, Tb, Dy, Y, and Yb have dielectric constants in the range 19–22 and negative τf . 相似文献
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