共查询到18条相似文献,搜索用时 437 毫秒
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对样品测量时的微波消解条件、原子荧光仪器条件及盐酸羟胺添加量等因素进行了研究。建立了微波消解-原子荧光光度法测定化妆品中汞含量的方法。利用该法测得汞检出限及加标回收率等参数均优于国标限量要求,且在节省试剂与人员成本的基础上,得到满意的测量审核结果,为化妆品中汞含量测定的方法确定与质量控制提供了一种快捷准确的分析模式。 相似文献
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采用密闭微波消解技术对化妆品样品进行消解,用氢化物原子荧光法测定样品中的汞。改变仪器条件及溶液浓度进行试验,找出最佳仪器参数及各种因素对化妆品中汞测定的影响规律。汞浓度在0-20μg/L范围内与原子荧光强度呈良好的线性关系。相关系数为0.9997,方法检出限为0.0738μg/L,汞的相对标准偏差为1.55%。 相似文献
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采用微波消解-氢化物发生-原子荧光光谱法对七种食品和三种化妆品中Hg含量进行测定,讨论并确定了样品的预处理方法和还原剂浓度。结果表明,食品和化妆品中Hg的检出限为0.0100μg/L和0.0070μg/L,回收率为88.93%~107.75%,相对偏差为≤5.75%。该方法准确、灵敏、简便、快速,是测定食品和化妆品中Hg含量的理想方法。 相似文献
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研究随机抽取了市场上销售的21种化妆品,采用微波消解对样品进行预处理,原子吸收分光光度法测定化妆品中重金属铅的含量,并对化妆品中重金属铅(Pb)的含量进行分析,研究成果对人们日常如何正确以及合理使用化妆品具有指导价值。 相似文献
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微波消解钼酸铵分光光度法测定水中总磷 总被引:6,自引:0,他引:6
微波消解作为样品预处理的新技术已受到普遍关注,作者讨论了微波消解在总磷测定中的应用,该法较传统消解法省时、省电,具有良好的精密度和准确度。 相似文献
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采用正交表L9(34)进行了烟草中总氮测定消化条件的筛选实验。实验考察了四个因子:称样量、硫酸钾用量、硫酸用量、氧化汞用量,每个因子各三水平的实验条件,经过直观分析、方差分析,确定在显著性水平0.10上,称样量和氧化汞用量都是显著的,硫酸钾用量和硫酸用量不显著;在显著性水平0.05上,氧化汞用量是显著的,称样量、硫酸钾用量和硫酸用量不显著。选用称样量和氧化汞用量的最优条件,即称样量0.3g、氧化汞用量0.1g,对硫酸钾用量和硫酸用量。主要考虑节约实验成本,选择硫酸钾用量1g和硫酸用量5mL为最终实验条件。 相似文献
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The effect of microwave output power and sample amount on effective moisture diffusivity were investigated using microwave drying technique on round okra (Hibiscus esculentus L.). The various microwave output powers ranging from 180 to 900 W were used for the determination of effective moisture diffusivity for constant sample amount of 100 g okra. To examine the effect of sample amount on effective moisture diffusivity, the samples in the range of 25-100 g were dried at constant microwave output power of 360 W. By increasing the microwave output powers and decreasing the sample amounts, the effective moisture diffusivity values ranged from 20.52 × 10-10 to 86.17 × 10-10 and 34.87 × 10-10 to 11.91 × 10-9 m2/s-1, respectively. The modeling studies were performed to illustrate the relationship between the ratio of the microwave output power to sample amount and effective moisture diffusivity. The relationship between drying constant and effective moisture diffusivity was also estimated. 相似文献
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The effect of microwave output power and sample amount on effective moisture diffusivity were investigated using microwave drying technique on round okra (Hibiscus esculentus L.). The various microwave output powers ranging from 180 to 900 W were used for the determination of effective moisture diffusivity for constant sample amount of 100 g okra. To examine the effect of sample amount on effective moisture diffusivity, the samples in the range of 25–100 g were dried at constant microwave output power of 360 W. By increasing the microwave output powers and decreasing the sample amounts, the effective moisture diffusivity values ranged from 20.52 × 10?10 to 86.17 × 10?10 and 34.87 × 10?10 to 11.91 × 10?9 m2/s?1, respectively. The modeling studies were performed to illustrate the relationship between the ratio of the microwave output power to sample amount and effective moisture diffusivity. The relationship between drying constant and effective moisture diffusivity was also estimated. 相似文献