The new catalytic kinetic spectrophotometric method for Au（III） determination was developed and validated. It was based on the catalytic effect of gold on the oxidation of sudan red III by ammonium peroxodisulfate ...The new catalytic kinetic spectrophotometric method for Au（III） determination was developed and validated. It was based on the catalytic effect of gold on the oxidation of sudan red III by ammonium peroxodisulfate （（NH4）2S2O8） with nitrilo triacetic acid as an activator in microemulsion and H2SO4 medium. Under optimum conditions, there was the linearity of the calibration curve in the concentration range from 0 to 20 μg/L Au（Ⅲ） at 520 nm. The relative standard deviation was 3.0% with a correlation coefficient of 0.9986. The detection limit achieved was 9.75 × 10^-5 μg/mL. A new method using a column packed with sulfhydryl dextrose gel （SDG） as a solid-phase extractant has been developed for the preconcentration and separation of Au（Ⅲ） ions. The method has been applied to the determination of trace gold with satisfactory results.展开更多
【目的】为内蒙古地区宜机械粒收玉米品种评价提供数据支持及生产上宜机械粒收玉米品种选择和适时收获提供参考。【方法】以极早熟、早熟、中早熟、中熟、中晚熟、晚熟6个熟期组代表玉米品种为试验材料,在内蒙古7个玉米种植区域同步开...【目的】为内蒙古地区宜机械粒收玉米品种评价提供数据支持及生产上宜机械粒收玉米品种选择和适时收获提供参考。【方法】以极早熟、早熟、中早熟、中熟、中晚熟、晚熟6个熟期组代表玉米品种为试验材料,在内蒙古7个玉米种植区域同步开展机械粒收性状研究,于生理成熟,生理成熟后10、20、30 d 4个收获时间,测定植株倒伏倒折率、籽粒含水率以及籽粒破碎率、籽粒破损率、杂质率;利用内蒙古各区域鉴选的宜机械粒收品种进行60000、75000、90000、105000株/hm^(2)4个密度梯度下的产量比较。【结果】植株倒伏倒折率随生理成熟后天数的增加呈上升趋势;籽粒含水率和脱水速率随生理成熟后天数的增加呈下降趋势;籽粒破碎率、籽粒破损率、杂质率均随生理成熟后天数的增加而降低。籽粒破碎率、籽粒破损率、杂质率与籽粒含水率均呈一元二次曲线关系,当籽粒含水率依次为16.1%、17.0%和15.6%时,籽粒破碎率、籽粒破损率、杂质率最小,分别为1.3%、1.1%和0.6%。脱水速率与日平均气温呈一元二次曲线关系,当日平均气温在0~5℃时,脱水缓慢,日脱水0.197~0.211个百分点,从生理成熟到籽粒含水率降至25.0%时所需的积温为100~200℃。各区域宜机械粒收品种的适宜种植密度为90000株/hm^(2)。【结论】明确了宜机械粒收玉米评价指标:收获期植株倒伏倒折率≤5.0%、籽粒含水率≤25.0%、籽粒破碎率≤5.0%、籽粒破损率≤2.0%、杂质率≤1.1%、产量损失率≤5.0%,适宜收获期为生理成熟后10~20 d,适宜种植密度为90000株/hm^(2)。展开更多
文摘The new catalytic kinetic spectrophotometric method for Au（III） determination was developed and validated. It was based on the catalytic effect of gold on the oxidation of sudan red III by ammonium peroxodisulfate （（NH4）2S2O8） with nitrilo triacetic acid as an activator in microemulsion and H2SO4 medium. Under optimum conditions, there was the linearity of the calibration curve in the concentration range from 0 to 20 μg/L Au（Ⅲ） at 520 nm. The relative standard deviation was 3.0% with a correlation coefficient of 0.9986. The detection limit achieved was 9.75 × 10^-5 μg/mL. A new method using a column packed with sulfhydryl dextrose gel （SDG） as a solid-phase extractant has been developed for the preconcentration and separation of Au（Ⅲ） ions. The method has been applied to the determination of trace gold with satisfactory results.
文摘【目的】为内蒙古地区宜机械粒收玉米品种评价提供数据支持及生产上宜机械粒收玉米品种选择和适时收获提供参考。【方法】以极早熟、早熟、中早熟、中熟、中晚熟、晚熟6个熟期组代表玉米品种为试验材料,在内蒙古7个玉米种植区域同步开展机械粒收性状研究,于生理成熟,生理成熟后10、20、30 d 4个收获时间,测定植株倒伏倒折率、籽粒含水率以及籽粒破碎率、籽粒破损率、杂质率;利用内蒙古各区域鉴选的宜机械粒收品种进行60000、75000、90000、105000株/hm^(2)4个密度梯度下的产量比较。【结果】植株倒伏倒折率随生理成熟后天数的增加呈上升趋势;籽粒含水率和脱水速率随生理成熟后天数的增加呈下降趋势;籽粒破碎率、籽粒破损率、杂质率均随生理成熟后天数的增加而降低。籽粒破碎率、籽粒破损率、杂质率与籽粒含水率均呈一元二次曲线关系,当籽粒含水率依次为16.1%、17.0%和15.6%时,籽粒破碎率、籽粒破损率、杂质率最小,分别为1.3%、1.1%和0.6%。脱水速率与日平均气温呈一元二次曲线关系,当日平均气温在0~5℃时,脱水缓慢,日脱水0.197~0.211个百分点,从生理成熟到籽粒含水率降至25.0%时所需的积温为100~200℃。各区域宜机械粒收品种的适宜种植密度为90000株/hm^(2)。【结论】明确了宜机械粒收玉米评价指标:收获期植株倒伏倒折率≤5.0%、籽粒含水率≤25.0%、籽粒破碎率≤5.0%、籽粒破损率≤2.0%、杂质率≤1.1%、产量损失率≤5.0%,适宜收获期为生理成熟后10~20 d,适宜种植密度为90000株/hm^(2)。
