[目的]对贵州省毕节市禽蛋产品中喹诺酮类药物的残留情况进行监测,并对该类药物残留进行风险评估。[方法]2023年1—11月从毕节市禽养殖场、超市和农贸市场随机采集231批次禽蛋产品,采用固相萃取-液相色谱串联质谱法检测7种喹诺酮类药物...[目的]对贵州省毕节市禽蛋产品中喹诺酮类药物的残留情况进行监测,并对该类药物残留进行风险评估。[方法]2023年1—11月从毕节市禽养殖场、超市和农贸市场随机采集231批次禽蛋产品,采用固相萃取-液相色谱串联质谱法检测7种喹诺酮类药物(恩诺沙星、环丙沙星、达氟沙星、诺氟沙星、氧氟沙星、洛美沙星和培氟沙星)残留情况,应用暴露评估中的点评估结合食品安全指数(index of food safety,IFS)评估禽蛋产品中喹诺酮类药物残留的安全性。[结果]7种喹诺酮类药物在0.005~0.1μg/mL浓度范围内线性相关性良好,相关系数(R^(2))均大于0.990;3个加标水平(2、6、10μg/kg)的回收率为64.2%~106.0%,相对标准偏差(RSD)小于15%(n=6);方法检出限和定量限分别为0.02~0.33μg/kg、0.07~1.10μg/kg,该方法简便、快捷、准确度高、精密度好、选择性强,能够满足禽蛋产品中喹诺酮类药物检测需求。在抽检的231批次禽蛋产品中,有15批次检出恩诺沙星和环丙沙星,检出率为6.5%,残留范围为0.94~15.1μg/kg,其中,有3批次禽蛋产品中恩诺沙星残留不符合《食品安全国家标准食品中41种兽药最大残留限量》(GB 31650.1—2022)规定的最大残留限量(10μg/kg)要求,超标率为1.3%。毕节市禽蛋产品中喹诺酮类药物残留的IFS平均值、最小值、最大值分别为5.23×10^(-4)、1.39×10^(-4)和8.61×10^(-4),均远小于1。[结论]毕节市禽蛋产品中喹诺酮类药物残留对人体健康的影响较小,风险可接受,但应加强监管和抽检力度。展开更多
Ga-doped Li_(7)La_(3)Zr_(2)O_(12)(Ga-LLZO)has long been considered as a promising garnet-type electrolyte candidate for all-solid-state lithium metal batteries(ASSLBs)due to its high room temperature ionic conductivit...Ga-doped Li_(7)La_(3)Zr_(2)O_(12)(Ga-LLZO)has long been considered as a promising garnet-type electrolyte candidate for all-solid-state lithium metal batteries(ASSLBs)due to its high room temperature ionic conductivity.However,the typical synthesis of Ga-LLZO is usually accompanied by the formation of undesired LiGaO_(2) impurity phase that causes severe instability of the electrolyte in contact with molten Li metal during half/full cell assembly.In this study,we show that by simply engineering the defect chemistry of Ga-LLZO,namely,the lithium deficiency level,LiGaO_(2) impurity phase is effectively inhibited in the final synthetic product.Consequently,defect chemistry engineered Ga-LLZO exhibits excellent electrochemical stability against lithium metal,while its high room temperature ionic conductivity(~1.9×10^(-3)S·cm^(-1))is well reserved.The assembled Li/Ga-LLZO/Li symmetric cell has a superior critical current density of 0.9 mA·cm^(-2),and cycles stably for 500 hours at a current density of 0.3 mA·cm^(-2).This research facilitates the potential commercial applications of high performance Ga-LLZO solid electrolytes in ASSLBs.展开更多
文摘[目的]对贵州省毕节市禽蛋产品中喹诺酮类药物的残留情况进行监测,并对该类药物残留进行风险评估。[方法]2023年1—11月从毕节市禽养殖场、超市和农贸市场随机采集231批次禽蛋产品,采用固相萃取-液相色谱串联质谱法检测7种喹诺酮类药物(恩诺沙星、环丙沙星、达氟沙星、诺氟沙星、氧氟沙星、洛美沙星和培氟沙星)残留情况,应用暴露评估中的点评估结合食品安全指数(index of food safety,IFS)评估禽蛋产品中喹诺酮类药物残留的安全性。[结果]7种喹诺酮类药物在0.005~0.1μg/mL浓度范围内线性相关性良好,相关系数(R^(2))均大于0.990;3个加标水平(2、6、10μg/kg)的回收率为64.2%~106.0%,相对标准偏差(RSD)小于15%(n=6);方法检出限和定量限分别为0.02~0.33μg/kg、0.07~1.10μg/kg,该方法简便、快捷、准确度高、精密度好、选择性强,能够满足禽蛋产品中喹诺酮类药物检测需求。在抽检的231批次禽蛋产品中,有15批次检出恩诺沙星和环丙沙星,检出率为6.5%,残留范围为0.94~15.1μg/kg,其中,有3批次禽蛋产品中恩诺沙星残留不符合《食品安全国家标准食品中41种兽药最大残留限量》(GB 31650.1—2022)规定的最大残留限量(10μg/kg)要求,超标率为1.3%。毕节市禽蛋产品中喹诺酮类药物残留的IFS平均值、最小值、最大值分别为5.23×10^(-4)、1.39×10^(-4)和8.61×10^(-4),均远小于1。[结论]毕节市禽蛋产品中喹诺酮类药物残留对人体健康的影响较小,风险可接受,但应加强监管和抽检力度。
基金financially supported by the National Natural Science Foundation of China (Grant No.52171221)the National Key Research and Development Program of China (Grant No.2019YFA0704900)。
文摘Ga-doped Li_(7)La_(3)Zr_(2)O_(12)(Ga-LLZO)has long been considered as a promising garnet-type electrolyte candidate for all-solid-state lithium metal batteries(ASSLBs)due to its high room temperature ionic conductivity.However,the typical synthesis of Ga-LLZO is usually accompanied by the formation of undesired LiGaO_(2) impurity phase that causes severe instability of the electrolyte in contact with molten Li metal during half/full cell assembly.In this study,we show that by simply engineering the defect chemistry of Ga-LLZO,namely,the lithium deficiency level,LiGaO_(2) impurity phase is effectively inhibited in the final synthetic product.Consequently,defect chemistry engineered Ga-LLZO exhibits excellent electrochemical stability against lithium metal,while its high room temperature ionic conductivity(~1.9×10^(-3)S·cm^(-1))is well reserved.The assembled Li/Ga-LLZO/Li symmetric cell has a superior critical current density of 0.9 mA·cm^(-2),and cycles stably for 500 hours at a current density of 0.3 mA·cm^(-2).This research facilitates the potential commercial applications of high performance Ga-LLZO solid electrolytes in ASSLBs.
