以H3PO4为提取剂,通过微波提取的方法,采用高效液相色谱-氢化物发生原子荧光光谱联用技术（HPLC-HG-AFS）实现了垃圾焚烧飞灰中砷的价态测定。重点探究了H3PO4存在下,使用HPLC-HG-AFS测定无机砷（As（Ⅲ）和As（Ⅴ）价态的色谱条件。结...以H3PO4为提取剂,通过微波提取的方法,采用高效液相色谱-氢化物发生原子荧光光谱联用技术（HPLC-HG-AFS）实现了垃圾焚烧飞灰中砷的价态测定。重点探究了H3PO4存在下,使用HPLC-HG-AFS测定无机砷（As（Ⅲ）和As（Ⅴ）价态的色谱条件。结果表明,当使用（NH4）2HPO4为流动相时,H3PO4的存在会对As？的分析造成不利影响,增大流动相流速对改善这种状况几乎没有效果;而使用Na2HPO4-KH2PO4混合溶液（p H 6.864）作为流动相时,可以显著降低H3PO4对As（Ⅴ）分析的干扰。在优化的色谱条件下,As（Ⅲ）和As（Ⅴ）可在5 min内实现分离,检出限分别为0.063和0.110μg/L。在标准物质加标回收实验中,各价态回收率良好（86.5%-102.5%）。利用本方法对来自4个垃圾焚烧电厂的飞灰样品进行分析,发现垃圾焚烧飞灰中的砷主要以As？的形式存在。展开更多
目的分析测定云南滇东8个州市鱼类中砷的形态以及含量。方法鱼类样品经石墨湿法消解,采用电感耦合等离子体质谱法测定总砷含量;相同的样品经1%硝酸热提取无机砷,采用液相色谱-原子荧光光谱法测定各形态砷含量。结果总砷及无机砷在一定...目的分析测定云南滇东8个州市鱼类中砷的形态以及含量。方法鱼类样品经石墨湿法消解,采用电感耦合等离子体质谱法测定总砷含量;相同的样品经1%硝酸热提取无机砷,采用液相色谱-原子荧光光谱法测定各形态砷含量。结果总砷及无机砷在一定浓度范围内分别有良好的线性关系,相关系数均大于0.999,总砷的加标回收率为93.57%~95.0%,其他形态砷的加标回收率为89.03%~92.04%,测定总砷的质控样均在参考值范围内。132件样品中总砷含量为0-2.31 m g/kg;无机砷中三价砷的含量为0~0.279mg/kg,其中昆明、红河及玉溪的样品有部分超标,超标率分别的为26.09%、22.22%、11.11%。结论有131件鱼样品检出总砷和无机砷,无机砷含量大部分达到国家标准要求,只有少部分超出标准限值。应加强对水产品中砷的监测,以确保鱼类食品的安全。展开更多
Almost every monocrystalline silicon solar cell design includes a wet chemical process step for the alkaline texturing of the wafer surface in order to reduce the reflection of the front side. The alkaline texturing s...Almost every monocrystalline silicon solar cell design includes a wet chemical process step for the alkaline texturing of the wafer surface in order to reduce the reflection of the front side. The alkaline texturing solution contains hydroxide, an organic additive usually 2-propanol and as a reaction product silicate. The hydroxide is consumed due to the reaction whereas 2-propanol evaporates during the process. Therefore, the correct replenishment for both components is required in order to achieve constant processing conditions. This may be simplified by using analytical methods for controlling the main components of the alkaline bath. This study gives an overview for a successful analytical method of the main components of an alkaline texturing bath by titration, HPLC, surface tension and NIR spectrometry.展开更多
文摘以H3PO4为提取剂,通过微波提取的方法,采用高效液相色谱-氢化物发生原子荧光光谱联用技术（HPLC-HG-AFS）实现了垃圾焚烧飞灰中砷的价态测定。重点探究了H3PO4存在下,使用HPLC-HG-AFS测定无机砷（As（Ⅲ）和As（Ⅴ）价态的色谱条件。结果表明,当使用（NH4）2HPO4为流动相时,H3PO4的存在会对As？的分析造成不利影响,增大流动相流速对改善这种状况几乎没有效果;而使用Na2HPO4-KH2PO4混合溶液（p H 6.864）作为流动相时,可以显著降低H3PO4对As（Ⅴ）分析的干扰。在优化的色谱条件下,As（Ⅲ）和As（Ⅴ）可在5 min内实现分离,检出限分别为0.063和0.110μg/L。在标准物质加标回收实验中,各价态回收率良好（86.5%-102.5%）。利用本方法对来自4个垃圾焚烧电厂的飞灰样品进行分析,发现垃圾焚烧飞灰中的砷主要以As？的形式存在。
文摘目的分析测定云南滇东8个州市鱼类中砷的形态以及含量。方法鱼类样品经石墨湿法消解,采用电感耦合等离子体质谱法测定总砷含量;相同的样品经1%硝酸热提取无机砷,采用液相色谱-原子荧光光谱法测定各形态砷含量。结果总砷及无机砷在一定浓度范围内分别有良好的线性关系,相关系数均大于0.999,总砷的加标回收率为93.57%~95.0%,其他形态砷的加标回收率为89.03%~92.04%,测定总砷的质控样均在参考值范围内。132件样品中总砷含量为0-2.31 m g/kg;无机砷中三价砷的含量为0~0.279mg/kg,其中昆明、红河及玉溪的样品有部分超标,超标率分别的为26.09%、22.22%、11.11%。结论有131件鱼样品检出总砷和无机砷,无机砷含量大部分达到国家标准要求,只有少部分超出标准限值。应加强对水产品中砷的监测,以确保鱼类食品的安全。
文摘Almost every monocrystalline silicon solar cell design includes a wet chemical process step for the alkaline texturing of the wafer surface in order to reduce the reflection of the front side. The alkaline texturing solution contains hydroxide, an organic additive usually 2-propanol and as a reaction product silicate. The hydroxide is consumed due to the reaction whereas 2-propanol evaporates during the process. Therefore, the correct replenishment for both components is required in order to achieve constant processing conditions. This may be simplified by using analytical methods for controlling the main components of the alkaline bath. This study gives an overview for a successful analytical method of the main components of an alkaline texturing bath by titration, HPLC, surface tension and NIR spectrometry.
