Thin PVA/zirconium oxychloride composite fibers were prepared by using sol-gel processing and electrospinning technique. After calcining the above precursor fibers,ZrO 2 nanofibers with a diameter of 70—100 nm were s...Thin PVA/zirconium oxychloride composite fibers were prepared by using sol-gel processing and electrospinning technique. After calcining the above precursor fibers,ZrO 2 nanofibers with a diameter of 70—100 nm were successfully obtained. The ZrO 2 nanofibers were characterized by XRD,TG-DTA,FTIR,and SEM,respectively. The results show that the crystallinity and morphology of ZrO 2 fibers are largely influenced by the calcination temperature.展开更多
建立了一种土壤中2,4-D的液相色谱-串联质谱的检测分析方法。样品经酸化乙腈提取,浓缩定容后过0.22μm微孔滤膜,采用色谱柱分离,以乙腈和0.25%甲酸溶液为流动相进行梯度洗脱,采用电喷雾ESI离子源方式和多信号扫描,外标法定量。在10.0~1...建立了一种土壤中2,4-D的液相色谱-串联质谱的检测分析方法。样品经酸化乙腈提取,浓缩定容后过0.22μm微孔滤膜,采用色谱柱分离,以乙腈和0.25%甲酸溶液为流动相进行梯度洗脱,采用电喷雾ESI离子源方式和多信号扫描,外标法定量。在10.0~1000μg/kg的质量浓度范围内,相关系数R^(2)为0.9999,该方法的定量检测限为10.0μg/kg。进行100μg/kg、200μg/kg和1000μg/kg三个不同水平浓度的添加回收试验,2,4-D的回收率在75.91%~98.05%之间,RSD介于5.94%~18.75%之间。该方法操作简单、灵敏度高、快速准确。利用该方法测定土壤中2,4-D残留量,施药后2 h 2,4-D在土壤上的原始附着量为73.4μg/kg,第21天残留量为≤10.0μg/kg,消解率为≥86.38%,半衰期T1/2为5.42 d。展开更多
Thin PVA/nickel acetate composite fibers were prepared by using sol-gel processing and electrospinning technique. After the calcination of the above precursor fibers,NiO nanofibres with a diameter of 50—100 nm could ...Thin PVA/nickel acetate composite fibers were prepared by using sol-gel processing and electrospinning technique. After the calcination of the above precursor fibers,NiO nanofibres with a diameter of 50—100 nm could be successfully obtained. The fibers were characterized by TG-DTA, FT-IR,WAXD and SEM respectively. The results showed that the crystalline phase and morphology of NiO fibres were greatly influenced by the calcination temperature. [WT5HZ]展开更多
文摘Thin PVA/zirconium oxychloride composite fibers were prepared by using sol-gel processing and electrospinning technique. After calcining the above precursor fibers,ZrO 2 nanofibers with a diameter of 70—100 nm were successfully obtained. The ZrO 2 nanofibers were characterized by XRD,TG-DTA,FTIR,and SEM,respectively. The results show that the crystallinity and morphology of ZrO 2 fibers are largely influenced by the calcination temperature.
文摘建立了一种土壤中2,4-D的液相色谱-串联质谱的检测分析方法。样品经酸化乙腈提取,浓缩定容后过0.22μm微孔滤膜,采用色谱柱分离,以乙腈和0.25%甲酸溶液为流动相进行梯度洗脱,采用电喷雾ESI离子源方式和多信号扫描,外标法定量。在10.0~1000μg/kg的质量浓度范围内,相关系数R^(2)为0.9999,该方法的定量检测限为10.0μg/kg。进行100μg/kg、200μg/kg和1000μg/kg三个不同水平浓度的添加回收试验,2,4-D的回收率在75.91%~98.05%之间,RSD介于5.94%~18.75%之间。该方法操作简单、灵敏度高、快速准确。利用该方法测定土壤中2,4-D残留量,施药后2 h 2,4-D在土壤上的原始附着量为73.4μg/kg,第21天残留量为≤10.0μg/kg,消解率为≥86.38%,半衰期T1/2为5.42 d。
文摘Thin PVA/nickel acetate composite fibers were prepared by using sol-gel processing and electrospinning technique. After the calcination of the above precursor fibers,NiO nanofibres with a diameter of 50—100 nm could be successfully obtained. The fibers were characterized by TG-DTA, FT-IR,WAXD and SEM respectively. The results showed that the crystalline phase and morphology of NiO fibres were greatly influenced by the calcination temperature. [WT5HZ]
