Dynamics and Removal-Transportation Model of Environmental Trace Organic Compounds in Urban Water Area

研究了琵琶湖/游渡河水系中氨基酸、壬基酚和阴离子表面活性剂的动态变化。建立了钼的高灵敏度自动测定方法。氨基酸动态研究琵琶湖北部流域总氨基酸平均产率为518 mg/m^2/d。据推测，其中约9%作为沉降粒子进入低阴离子。氨基酸的分解速度比总有机化合物快。根据氨基酸自身摩尔分数对总氨基酸含量的变化趋势，将氨基酸分为三类。单个氨基酸摩尔分数的变化受硅藻硬组织生物地球化学行为的影响。沉积物中壬基酚（NP）的动态浓度与日本和其他国家以前报道的水平相似，并且与底栖生物引起毒性的浓度相同或一个数量级。琵琶湖及其支流颗粒物NP呈季节变化，夏季浓度高于冬季。这可能是由微生物降解活动的季节性变化引起的。2 .琵琶湖悬浮颗粒中NP浓度与有机碳和叶绿素a浓度的相关性。阴离子表面活性剂的动态变化阴离子表面活性剂的溶解量低于悬浮量和沉降量。因此，推断沉降和沉积过程对其去除并不重要。它们的溶解浓度夏季高于冬季。这种季节变化是由微生物生物活性的变化引起的。钼自动测定方法的建立用催化分析法建立了地球化学样品中钼的高灵敏度测定方法。

Dynamics of amino acids, nonylphenol and anionic surfactants were investigated in Lake Biwa/Yodo River water system. High sensitive automatic determination method was developed for molybdenum.1. Dynamics of amino acidsMean production rate of total amino acids in northern basin of Lake Biwa was estimated to be 518 mg/m^2/day. About 9 % of this amount was inferred to go down to the hypolimnion as settling particles. Amino acids were decomposed faster than total organic compounds. Amino acids were classified to three groups based on the tendency of the change in their own mole fractions to total amino acid content. The change in mole fraction of the individual amino acid was affected by the bio-geochemical behavior of hard tissue of diatom.2. Dynamics of nonylphenol(NP)NP concentrations in the sediment were at similar level as those reported previously in Japan and other countries, and were at the same order or one order of magnitude lower than the concentrations which induce toxicity to benthic organisms. Particulate NP in Lake Biwa and its tributaries showed a seasonal variation that its concentration was higher in summer than in winter. This would be caused by seasonal change in the activity of microbiological degradation. NP concentration in suspended particles correlated with organic carbon and chlorophyll-a concentration in Lake Biwa.3. Dynamics of anionic surfactantsDissolved amount of anionic surfactants was lower than suspended or settling amount of those in Lake Biwa. Therefore, settling and sedimentation processes were inferred not to be significant ones for the removal of it. Their dissolved concentration was higher in summer than in winter. This seasonal variation was caused by the change in biological activity of micro-organisms.4. Development of automatic determination method for molybdenumHigh-sensitive method for molybdenum in geochemical samples was developed by using a catalytic analysis.