The analysis of hexavalent chromium, Cr(VI), in soil and sediment samples has been predominantly carried out in materials containing elevated levels. Reliable analysis of trace-level of Cr(VI) in sediment samples rema...The analysis of hexavalent chromium, Cr(VI), in soil and sediment samples has been predominantly carried out in materials containing elevated levels. Reliable analysis of trace-level of Cr(VI) in sediment samples remains challenging. Cr(VI) analyses with multipoint calibration and speciated isotope dilution (SID) adapted from U.S. EPA method 6800 were used to measure lower-level Cr(VI) on an ion chromatograph coupled with a tandem mass spectrometer (IC-MS/MS). Lake sediment samples were collected from various locations in Northern Ontario and Cr(VI) was extracted using both alkaline digestion and ethylene diaminetetraacetic acid (EDTA) extraction. Certified reference materials were extracted and analyzed by IC-MS/MS and UV-VIS detection. The SID-MS approach allowed for the quantification of Cr(VI) in samples with concentration levels below 0.5 μg.g-1 wet weight.展开更多
为快速定量唾液对玩具材料中六价铬的迁移量,采用模拟胃液迁移特定元素的迁移模型,在180 r/min的恒温水浴振荡器中,(37±2)℃恒温避光振荡1 h后,(37±2)℃静置1 h,模拟婴幼儿将玩具含入口中的过程。选择硝酸铵作为流动相,以Prin...为快速定量唾液对玩具材料中六价铬的迁移量,采用模拟胃液迁移特定元素的迁移模型,在180 r/min的恒温水浴振荡器中,(37±2)℃恒温避光振荡1 h后,(37±2)℃静置1 h,模拟婴幼儿将玩具含入口中的过程。选择硝酸铵作为流动相,以Prin-Cen ONLY WATER Kit for Cr(Ⅵ)Test Fast column色谱柱作为分析柱,使用紫外可见光检测器进行测定,建立了使用超痕量六价铬分析仪测定模拟唾液迁移玩具材料中六价铬的方法。结果表明,六价铬浓度在0~2μg/L范围内线性关系良好,相关系数能达到1.000,方法检出限为0.006μg/L,方法定量限为0.019μg/L。选取三种实际样品,在低浓度和高浓度下的加标回收率能达到95.0%~105%,在0.5μg/L中等浓度水平下,加标样品的相对标准偏差在3.1%~4.4%。对三种阳性样品进行测定,均能检出较高含量的Cr(Ⅵ)。方法具有良好的准确度和精密度,能应对常见的样品类型,有着较强的适用性。展开更多
文摘The analysis of hexavalent chromium, Cr(VI), in soil and sediment samples has been predominantly carried out in materials containing elevated levels. Reliable analysis of trace-level of Cr(VI) in sediment samples remains challenging. Cr(VI) analyses with multipoint calibration and speciated isotope dilution (SID) adapted from U.S. EPA method 6800 were used to measure lower-level Cr(VI) on an ion chromatograph coupled with a tandem mass spectrometer (IC-MS/MS). Lake sediment samples were collected from various locations in Northern Ontario and Cr(VI) was extracted using both alkaline digestion and ethylene diaminetetraacetic acid (EDTA) extraction. Certified reference materials were extracted and analyzed by IC-MS/MS and UV-VIS detection. The SID-MS approach allowed for the quantification of Cr(VI) in samples with concentration levels below 0.5 μg.g-1 wet weight.
文摘为快速定量唾液对玩具材料中六价铬的迁移量,采用模拟胃液迁移特定元素的迁移模型,在180 r/min的恒温水浴振荡器中,(37±2)℃恒温避光振荡1 h后,(37±2)℃静置1 h,模拟婴幼儿将玩具含入口中的过程。选择硝酸铵作为流动相,以Prin-Cen ONLY WATER Kit for Cr(Ⅵ)Test Fast column色谱柱作为分析柱,使用紫外可见光检测器进行测定,建立了使用超痕量六价铬分析仪测定模拟唾液迁移玩具材料中六价铬的方法。结果表明,六价铬浓度在0~2μg/L范围内线性关系良好,相关系数能达到1.000,方法检出限为0.006μg/L,方法定量限为0.019μg/L。选取三种实际样品,在低浓度和高浓度下的加标回收率能达到95.0%~105%,在0.5μg/L中等浓度水平下,加标样品的相对标准偏差在3.1%~4.4%。对三种阳性样品进行测定,均能检出较高含量的Cr(Ⅵ)。方法具有良好的准确度和精密度,能应对常见的样品类型,有着较强的适用性。
