The debate about climate change is highly politicized.Not everyone is convinced that CO_(2)emissions are worth curbing despite seemingly irrefutable evidence in the IPCC’s latest report.[1]Some have vested interests ...The debate about climate change is highly politicized.Not everyone is convinced that CO_(2)emissions are worth curbing despite seemingly irrefutable evidence in the IPCC’s latest report.[1]Some have vested interests in exploiting fossil fuels while others think alternative,cheaper solutions can be found.Countries that have shifted from manufacturing to service-based economies will find it easier to decarbonize.Other countries with relatively low carbon emissions per capita but large populations believe it is unfair that they should have to bear heavy costs of decarbonization to solve a problem that wealthier countries have created.展开更多
目的建立超级微波消解-电感耦合等离子体质谱(ICP-MS)法测定预制菜中26种元素含量的方法,为准确测定其含量提供方法依据。方法优化超级微波的消解酸体系、消解温度和压力、溶液酸度,用ICP-MS的He碰撞模式(KED)检测,以有证标准物质考察...目的建立超级微波消解-电感耦合等离子体质谱(ICP-MS)法测定预制菜中26种元素含量的方法,为准确测定其含量提供方法依据。方法优化超级微波的消解酸体系、消解温度和压力、溶液酸度,用ICP-MS的He碰撞模式(KED)检测,以有证标准物质考察其准确度和精密度。结果试样中加入3 mL HNO3+2 mL H2O的消解酸体系,220℃160 bar的消解温度压力下进行消解,消解后90℃赶酸1 h后定容测定,并以1%硝酸作为内标溶液酸度的消解条件效果最佳。通过菠菜、鸡肉和扇贝标准物质验证,26种元素在相应的含量范围内呈现良好线性关系(r≥0.9990),检测结果均在标准指定值范围内,相对标准偏差(RSD)在5%以内(n=7)。结论该研究建立的ICP-MS法操作简单,灵敏度高,可同时准确、快速、高通量检测预制菜中的26种元素含量,为预制菜质量监管和食品安全国家标准研制提供依据。展开更多
文摘The debate about climate change is highly politicized.Not everyone is convinced that CO_(2)emissions are worth curbing despite seemingly irrefutable evidence in the IPCC’s latest report.[1]Some have vested interests in exploiting fossil fuels while others think alternative,cheaper solutions can be found.Countries that have shifted from manufacturing to service-based economies will find it easier to decarbonize.Other countries with relatively low carbon emissions per capita but large populations believe it is unfair that they should have to bear heavy costs of decarbonization to solve a problem that wealthier countries have created.
文摘目的建立超级微波消解-电感耦合等离子体质谱(ICP-MS)法测定预制菜中26种元素含量的方法,为准确测定其含量提供方法依据。方法优化超级微波的消解酸体系、消解温度和压力、溶液酸度,用ICP-MS的He碰撞模式(KED)检测,以有证标准物质考察其准确度和精密度。结果试样中加入3 mL HNO3+2 mL H2O的消解酸体系,220℃160 bar的消解温度压力下进行消解,消解后90℃赶酸1 h后定容测定,并以1%硝酸作为内标溶液酸度的消解条件效果最佳。通过菠菜、鸡肉和扇贝标准物质验证,26种元素在相应的含量范围内呈现良好线性关系(r≥0.9990),检测结果均在标准指定值范围内,相对标准偏差(RSD)在5%以内(n=7)。结论该研究建立的ICP-MS法操作简单,灵敏度高,可同时准确、快速、高通量检测预制菜中的26种元素含量,为预制菜质量监管和食品安全国家标准研制提供依据。
