目的:针对贝类中高毒重金属铅(Pb)和镉(Cd),开发一种可再生、廉价、快速、灵敏的电化学传感器。方法:以自制离子液体/石墨烯电极(IL/GNs HME)为工作电极,采用微分脉冲阳极溶出伏安法(DPASV)原位镀铋,根据得到的溶出峰电流,实现对Pb^(2+)...目的:针对贝类中高毒重金属铅(Pb)和镉(Cd),开发一种可再生、廉价、快速、灵敏的电化学传感器。方法:以自制离子液体/石墨烯电极(IL/GNs HME)为工作电极,采用微分脉冲阳极溶出伏安法(DPASV)原位镀铋,根据得到的溶出峰电流,实现对Pb^(2+)和Cd^(2+)的同步测定。结果:在铋离子质量浓度500μg/L,富集时间420 s,搅拌速度600 r/min,富集电压-1.1 V,缓冲体系HAc-Na Ac p H 4.2的条件下,利用电化学传感器测得的Pb^(2+)和Cd^(2+)的线性范围均为1.0~45.0μg/L,检测限分别达0.5μg/L和0.8μg/L。采用IL/GNs HME电化学传感器同时检测扇贝、褶牡蛎、长竹蛏、菲律宾蛤子中Pb^(2+)、Cd^(2+)含量时,所得结果均与电感耦合等离子体质谱(ICP-MS)检测结果相符。结论:基于IL/GNs HME构建的电化学传感器操作简便、灵敏度高,可实现对贝类中Pb^(2+)、Cd^(2+)含量的快速、同步测定。展开更多
All eyes turned to a small town in the south of France on May 14 as a fleet of Hollywood icons and current A-listers took center stage at the 77th Cannes Film Festival.The event kicked off with an honorary Palme d'...All eyes turned to a small town in the south of France on May 14 as a fleet of Hollywood icons and current A-listers took center stage at the 77th Cannes Film Festival.The event kicked off with an honorary Palme d'Or award,the festival's enduring symbol of prestige,for American actress Meryl Streep and closed with an award for Star Wars director George Lucas.展开更多
Watching Hollywood blockbusters in throngs and with bags of popcorn in arms used to be a kind of coming-ofage party for Chinese millennials,who spent their childhood and teenage years admiring the mighty cohort of Ame...Watching Hollywood blockbusters in throngs and with bags of popcorn in arms used to be a kind of coming-ofage party for Chinese millennials,who spent their childhood and teenage years admiring the mighty cohort of American superheroes and secret agents.Little did Hollywood know that its usual cinematic magic would one day fizzle out.展开更多
This year's Boao Forum for Asia(BFA)Annual Conference officially concluded on March 29,after four days of heated discussions among representatives from across the globe on Asia's development strategies for 202...This year's Boao Forum for Asia(BFA)Annual Conference officially concluded on March 29,after four days of heated discussions among representatives from across the globe on Asia's development strategies for 2024 and beyond.Amid a wide spectrum of trending topics,a novel concept stood out in this year's agenda:new quality productive forces.展开更多
As if in the grip of an unknown force,screens around the world simultaneously began to display one single bold-lettered message on March 25,"YOU ARE BUGS."The message had cropped up on social media feeds,pop...As if in the grip of an unknown force,screens around the world simultaneously began to display one single bold-lettered message on March 25,"YOU ARE BUGS."The message had cropped up on social media feeds,popped out in the middle of YouTube videos and found its way onto train station schedule boards in Rome and Milan,billboards in Tokyo's Shinjuku district,the dome-shaped Sphere entertainment venue in Las Vegas and the gigantic electronic billboard in London's Piccadilly Circus.展开更多
文摘目的:针对贝类中高毒重金属铅(Pb)和镉(Cd),开发一种可再生、廉价、快速、灵敏的电化学传感器。方法:以自制离子液体/石墨烯电极(IL/GNs HME)为工作电极,采用微分脉冲阳极溶出伏安法(DPASV)原位镀铋,根据得到的溶出峰电流,实现对Pb^(2+)和Cd^(2+)的同步测定。结果:在铋离子质量浓度500μg/L,富集时间420 s,搅拌速度600 r/min,富集电压-1.1 V,缓冲体系HAc-Na Ac p H 4.2的条件下,利用电化学传感器测得的Pb^(2+)和Cd^(2+)的线性范围均为1.0~45.0μg/L,检测限分别达0.5μg/L和0.8μg/L。采用IL/GNs HME电化学传感器同时检测扇贝、褶牡蛎、长竹蛏、菲律宾蛤子中Pb^(2+)、Cd^(2+)含量时,所得结果均与电感耦合等离子体质谱(ICP-MS)检测结果相符。结论:基于IL/GNs HME构建的电化学传感器操作简便、灵敏度高,可实现对贝类中Pb^(2+)、Cd^(2+)含量的快速、同步测定。
文摘All eyes turned to a small town in the south of France on May 14 as a fleet of Hollywood icons and current A-listers took center stage at the 77th Cannes Film Festival.The event kicked off with an honorary Palme d'Or award,the festival's enduring symbol of prestige,for American actress Meryl Streep and closed with an award for Star Wars director George Lucas.
文摘Watching Hollywood blockbusters in throngs and with bags of popcorn in arms used to be a kind of coming-ofage party for Chinese millennials,who spent their childhood and teenage years admiring the mighty cohort of American superheroes and secret agents.Little did Hollywood know that its usual cinematic magic would one day fizzle out.
文摘This year's Boao Forum for Asia(BFA)Annual Conference officially concluded on March 29,after four days of heated discussions among representatives from across the globe on Asia's development strategies for 2024 and beyond.Amid a wide spectrum of trending topics,a novel concept stood out in this year's agenda:new quality productive forces.
文摘As if in the grip of an unknown force,screens around the world simultaneously began to display one single bold-lettered message on March 25,"YOU ARE BUGS."The message had cropped up on social media feeds,popped out in the middle of YouTube videos and found its way onto train station schedule boards in Rome and Milan,billboards in Tokyo's Shinjuku district,the dome-shaped Sphere entertainment venue in Las Vegas and the gigantic electronic billboard in London's Piccadilly Circus.
