建立了柱切换离子色谱法测海水中草酸根离子的方法。采用Dionex Ion Pac AS11-HC(4 mm×250 mm)阴离子分离柱和AG11-HC(4 mm×50 mm)保护柱分离海水中草酸根,采用20 mmol/L KOH淋洗液,流速为1.0 m L/min等度淋洗,通过柱切换除...建立了柱切换离子色谱法测海水中草酸根离子的方法。采用Dionex Ion Pac AS11-HC(4 mm×250 mm)阴离子分离柱和AG11-HC(4 mm×50 mm)保护柱分离海水中草酸根,采用20 mmol/L KOH淋洗液,流速为1.0 m L/min等度淋洗,通过柱切换除去海水中大部分的高浓度阴离子(Cl^-、SO_4^(2-)和Br^-),分离出的C_2O_4^(2-)收集于富集柱,然后经过阀切换,将目标离子从富集柱上洗脱,进入阴离子分析柱分离,此时淋洗液换成30 mmol/L Na OH溶液,流速为0.8 m L/min等度淋洗,电导法检测。结果表明,在线性范围为0.5~10.0 mg/L内其相关系数为0.999 4,相对标准偏差为1.48%(n=6),最低检出限为4.35μg/L(S/N=3),所得样品回收率为85.3%~110.0%。该实验方法简单方便,且具有较好的重现性和较低的检出限,可用于检测海水中的草酸根离子。展开更多
Apatite ceramics Ca10(PO4)6 X2(X=F,OH)were prepared by the standard solid state sintering method and irradiated with He ions under a fluence of 5×10^16 ions/cm^2 at 450℃.Irradiation induced formation and growth ...Apatite ceramics Ca10(PO4)6 X2(X=F,OH)were prepared by the standard solid state sintering method and irradiated with He ions under a fluence of 5×10^16 ions/cm^2 at 450℃.Irradiation induced formation and growth of the He bubbles were observed by a transmission electron microscope.Hydroxyapatite Ca10(PO4)6(OH)2 and fluoroapatite Ca10(PO4)6 F2 with different He bubble morphologies indicate the influence of OH^-/F^-substitution on the He-ion annealing efficiency,as well as the structure itself,which affects the process of He bubble evolution and formation.The grain boundaries also act as sinks to accumulate He bubbles.No obvious irradiation damage but slight intensity reduction and left shift of diffraction peaks were observed according to the grazing incidence x-ray diffraction and Raman spectra characterizations,indicating that defects of interstitials and vacancies were generated.展开更多
利用离子色谱分离电化学检测,建立了化妆品中磺胺类物质的检测方法。实验优化了影响磺胺类物质色谱分离因素,主要有柱温、淋洗液的配比、电极、电位和流速。结果表明,柱温35℃、淋洗液0.1 mol/L(14%)的KOH溶液、流速0.25 m L/min、Au电...利用离子色谱分离电化学检测,建立了化妆品中磺胺类物质的检测方法。实验优化了影响磺胺类物质色谱分离因素,主要有柱温、淋洗液的配比、电极、电位和流速。结果表明,柱温35℃、淋洗液0.1 mol/L(14%)的KOH溶液、流速0.25 m L/min、Au电极和氨基酸电位(积分脉冲安培电位)、参比电极Ag/Ag Cl为分离9种磺胺类物质的最优条件。方法拥有良好的线性(r≥0.999 1)、检出限(≤1.0×10^(-2)mg/L)、重现性(RSD≤2.78%,n=8)及回收率(85.8%~113%),可用于检测复杂基体中的磺胺类化合物。展开更多
文摘建立了柱切换离子色谱法测海水中草酸根离子的方法。采用Dionex Ion Pac AS11-HC(4 mm×250 mm)阴离子分离柱和AG11-HC(4 mm×50 mm)保护柱分离海水中草酸根,采用20 mmol/L KOH淋洗液,流速为1.0 m L/min等度淋洗,通过柱切换除去海水中大部分的高浓度阴离子(Cl^-、SO_4^(2-)和Br^-),分离出的C_2O_4^(2-)收集于富集柱,然后经过阀切换,将目标离子从富集柱上洗脱,进入阴离子分析柱分离,此时淋洗液换成30 mmol/L Na OH溶液,流速为0.8 m L/min等度淋洗,电导法检测。结果表明,在线性范围为0.5~10.0 mg/L内其相关系数为0.999 4,相对标准偏差为1.48%(n=6),最低检出限为4.35μg/L(S/N=3),所得样品回收率为85.3%~110.0%。该实验方法简单方便,且具有较好的重现性和较低的检出限,可用于检测海水中的草酸根离子。
基金Natural Science Foundation of Fujian Province,China(Grant No.2017J01007)partially by the Energy Development Foundation of Energy College(Grant No.2018NYFZ01)。
文摘Apatite ceramics Ca10(PO4)6 X2(X=F,OH)were prepared by the standard solid state sintering method and irradiated with He ions under a fluence of 5×10^16 ions/cm^2 at 450℃.Irradiation induced formation and growth of the He bubbles were observed by a transmission electron microscope.Hydroxyapatite Ca10(PO4)6(OH)2 and fluoroapatite Ca10(PO4)6 F2 with different He bubble morphologies indicate the influence of OH^-/F^-substitution on the He-ion annealing efficiency,as well as the structure itself,which affects the process of He bubble evolution and formation.The grain boundaries also act as sinks to accumulate He bubbles.No obvious irradiation damage but slight intensity reduction and left shift of diffraction peaks were observed according to the grazing incidence x-ray diffraction and Raman spectra characterizations,indicating that defects of interstitials and vacancies were generated.
