Highly Sensitive Monitoring of Humic Substances in Environment with a Fluorescent Labeling Reagent

腐殖质是淡水的主要有机成分，它与有毒重金属相互作用强烈，可能是氯处理水过程中形成的三卤甲烷(THM)的前体。然而，关于腐殖质在环境水中行为的研究报道很少。1)发展了用凝胶色谱-荧光检测器同时测定浓缩和非浓缩环境水样中腐殖质的浓度和相对分子质量。河流中水生腐殖质浓度夏季高，冬季低。高分子量腐殖质的比例在温暖季节大于凉爽季节。河水中水生腐殖质的主要来源可能是河流周围土壤中的腐殖质。2)流动铝毒性对树木的伤害可能是酸沉积导致森林衰退的可能途径之一。用阳离子交换剂和阴离子交换剂分离铝后，采用流动注射荧光检测法测定土壤萃取物中铝的化学形态

Humic substances, which interact strongly with toxic heavy metals and may be precursors of trihalomethane (THM) formed during water treatment with chlorine, are the major organic constituents of fresh water. However, few studies about the behavior of humic substances in environmental water have been reported.1) Simultaneous determinations of the concentration and molecular weight of humic substances in concentrated and nonconcentrated environmental water samples by gel chromatography with a fluorescence detector were developed. The concentrations of aquatic humic substances in rivers were high in the summer and low in the winter. The ratio of the higher molecular weight of humic substances was larger in the warmer season than in the cooler season. The main origin of aquatic humic substances in river water may be humic substances from soils around the rivers.2) The damage of trees caused by the toxicity of mobile aluminum may be one of the possible pathways of forest decline due to acidic deposition. Flow-injection analysis with fluorescent detection of the lumogallion complex after Al fractionation with cation and anion exchangers was applied to chemical speciation of aluminum in soil extracts