Principal ideas, research approaches and installations in both Liangshui and Maoershan Ecological Stations were diseussed. Significance of comparability and synchronous detennination in research methods were stressed....Principal ideas, research approaches and installations in both Liangshui and Maoershan Ecological Stations were diseussed. Significance of comparability and synchronous detennination in research methods were stressed. Comparison analysis was done on the results gained from diferent methods. Adaptive mechanisms of Mongolian oak (Quercus mongolica) to drought and unproductive sites wer expounded through hydrological cycling studies. Surface runoff and flood peak were decreased and the developing processes of flood peak were postponed or delayed because of the presence of huge forest canopy and forest floor. However, the conclusions of forest influences on total runoff,especially in spring and in the dry season t are significant to agricultul practices in notheast China and turned out contrary for satershed sizes or different approaches, which should be studied further.展开更多
采用C18毛细管整体柱作为固相微萃取整体柱,构建在线固相微萃取-高效液相色谱联用系统,同步富集检测环境水样中的5种苯氧羧酸类除草剂。详细考察了联用系统运行条件对富集检测的影响。联用系统运行最佳参数为：固相微萃取整体柱长度20 ...采用C18毛细管整体柱作为固相微萃取整体柱,构建在线固相微萃取-高效液相色谱联用系统,同步富集检测环境水样中的5种苯氧羧酸类除草剂。详细考察了联用系统运行条件对富集检测的影响。联用系统运行最佳参数为：固相微萃取整体柱长度20 cm,进样流速0.04 m L/min,进样13 min,洗脱流速0.02 m L/min,洗脱5 min。在最佳条件下,5种苯氧羧酸类除草剂的检出限为：9μg/L（苯氧丙酸）、4μg/L（2-（2-氯）-苯氧丙酸）、4μg/L（2-（3-氯）-苯氧丙酸）、5μg/L（2,4-二氯苯氧乙酸）、5μg/L（2-（2,4-二氯苯氧基）丙酸）。与HPLC系统直接进样对比,联用系统对5种检测对象表现出优良的富集能力。5种苯氧羧酸类除草剂的回收率在79.0%～98.0%之间（RSD≤3.9%）。该方法成功应用于水样中5种苯氧羧酸类除草剂的检测,结果令人满意。展开更多
文摘Principal ideas, research approaches and installations in both Liangshui and Maoershan Ecological Stations were diseussed. Significance of comparability and synchronous detennination in research methods were stressed. Comparison analysis was done on the results gained from diferent methods. Adaptive mechanisms of Mongolian oak (Quercus mongolica) to drought and unproductive sites wer expounded through hydrological cycling studies. Surface runoff and flood peak were decreased and the developing processes of flood peak were postponed or delayed because of the presence of huge forest canopy and forest floor. However, the conclusions of forest influences on total runoff,especially in spring and in the dry season t are significant to agricultul practices in notheast China and turned out contrary for satershed sizes or different approaches, which should be studied further.
文摘采用C18毛细管整体柱作为固相微萃取整体柱,构建在线固相微萃取-高效液相色谱联用系统,同步富集检测环境水样中的5种苯氧羧酸类除草剂。详细考察了联用系统运行条件对富集检测的影响。联用系统运行最佳参数为：固相微萃取整体柱长度20 cm,进样流速0.04 m L/min,进样13 min,洗脱流速0.02 m L/min,洗脱5 min。在最佳条件下,5种苯氧羧酸类除草剂的检出限为：9μg/L（苯氧丙酸）、4μg/L（2-（2-氯）-苯氧丙酸）、4μg/L（2-（3-氯）-苯氧丙酸）、5μg/L（2,4-二氯苯氧乙酸）、5μg/L（2-（2,4-二氯苯氧基）丙酸）。与HPLC系统直接进样对比,联用系统对5种检测对象表现出优良的富集能力。5种苯氧羧酸类除草剂的回收率在79.0%～98.0%之间（RSD≤3.9%）。该方法成功应用于水样中5种苯氧羧酸类除草剂的检测,结果令人满意。
