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排序方式: 共有1365条查询结果,搜索用时 93 毫秒
551.
552.
分别用混合酸湿法消解和微波消解两种方法处理鱼虾样品,用原子吸收法测定样品中铜、锌、铅、镉、铬的含量.结果表明微波消解相对标准偏差均在4.0%以下,加标回收率在95.6%~112%之间.湿法消解相对标准偏差在0.3%~5.6%之间,加标回收率在88.9%~115%之间.微波消解比湿法消解的精密度、准确度高,且微波消解操作安全简便,耗时短,适用于样品数量多的情况.混合酸湿法消解操作复杂,耗时长,由于使用了在高温下易爆的高氯酸,又容易发生"炭化"现象,安全性差,在样品数量少的情况下可用此法. 相似文献
553.
铜在鲤鱼(Cyprinus carpio)鱼鳃微环境中的形态分布 总被引:1,自引:0,他引:1
利用Playle设计的装置测定了不同铜暴露水平下鲤鱼鳃部进出水中的游离铜离子浓度、粘液含量及有关参数.用MINTEQA2和单配位体模型联合的试算方法计算了不同形态铜含量以及鳃部粘液对铜的络合能力.结果表明,利用该算法可以获得鱼鳃微环境金属形态分布的准确结果,同时可以得到与鱼鳃粘液络合能力有关的参数.随着暴露铜含量增加,粘液分泌量随之增加,鱼鳃微环境pH和碱度也有所上升.鱼鳃粘液的络合当量浓度(Cu/C)和稳定常数(对数)分别为0.95mmol/mg和5.32.就铜形态分布而言,鱼鳃微环境与外部水相的主要差别表现在相对较高的羟基络合态铜含量以及占总量3%~20%的鱼鳃粘液络合态铜. 相似文献
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556.
Adsorption and cosorption of cadmium and glyphosate on two soils with different characteristics 总被引:16,自引:0,他引:16
Glyphosate [N-(phosphonomethyl)glycine] (GPS; H3G) is a widely used pesticide throughout the world. It affects metal behaviors in soil-plant system due to its functional groups, which react with metal ions to form metal complexes. Adsorption and cosorption of cadmium and glyphosate on a Wushan soil (WS soil, Anthrosol) and a Zhuanhong soil (ZH soil, Udic Ferrisol) as affect by solution pH were studied by means of batch adsorption experiments. It indicated that the adsorption quantity of Cd or glyphosate was highly relevant to soil characteristics. The WS soil had higher adsorption capacity of Cd than the ZH soil, due to its high organic matter content and cation exchange capacity (CEC). In contrast, the adsorption quantity of glyphosate on the WS soil was less than that on the ZH soil, because the WS soil has lower iron and aluminum oxides content but higher pH than the ZH soil. The herbicide glyphosate affected Cd adsorption on the two soils when they coexisted in a same soil solution, which was attributed to a glyphosate-induced pH-decrease and the corresponding decline in negative surface charges of the soil. Beside that, glyphosate reacted with solution Cd to form the water-soluble complexes that had lower affinity to soil surface in comparison with Cd itself. On the other hand, the presence of Cd in the soil solution also affected the adsorption of glyphosate on the soils. The presence of Cd increased adsorption quantity of glyphosate on the WS and ZH soils, which was resulted from the decrease of equilibrium solution pH caused by Cd2+ exchange with H+ ions of soil surface. In addition to that, glyphosate adsorption possibly takes place on sites where Cd was previously adsorbed and acted as a bridge between the soil and glyphosate. 相似文献
557.
558.
Toxicological and biochemical responses of the earthworm Lumbricus rubellus to pyrene, a non-carcinogenic polycyclic aromatic hydrocarbon 总被引:7,自引:0,他引:7
The effects of the polycyclic aromatic hydrocarbon (PAH) pyrene on earthworms were investigated in contact and soil tests. In addition to measuring toxic effects on survival and reproduction, Ethoxyresorufin-o-deethylase (EROD) activity and catalase activity were also studied as possible biomarkers of toxic stress. The survival data indicated that LC50 values were 0.0068 mg/ml for the contact test, and 283 mg/kg in the soil test. Cocoon production rate was significantly reduced compared to controls at 160, 640 and 2560 mg/kg in the soil test. No EROD activity could be detected in preliminary studies using control and exposed animals from the contact test, so this assay was not used to the soil test. Catalase activity was shown to be significantly lower at 640 mg/kg in the soil test compared to all other treatments and the control. When compared to toxicological data for other soil invertebrates, Lumbricus rubellus has an intermediate sensitivity in respects of survival and a lower sensitivity for reproductive effects, although the soil used in this study had a higher organic content than previous studies, meaning that the sensitivity of this species may be underestimated in comparison to previous published data for other soil invertebrates. 相似文献
559.
Niagolova N McElmurry SP Voice TC Long DT Petropoulos EA Havezov I Chou K Ganev V 《Environmental pollution (Barking, Essex : 1987)》2005,134(2):229-237
This study explored two hypotheses relating elevated concentrations of nitrogen species in drinking water and the disease Balkan Endemic Nephropathy (BEN). Drinking water samples were collected from a variety of water supplies in both endemic and non-endemic villages in the Vratza and Montana districts of Bulgaria. The majority of well water samples exceeded US drinking water standards for nitrate + nitrite. No statistically significant difference was observed for any of the nitrogen species between villages classified as endemic and non-endemic. Other constituents (sodium, potassium and chloride) known to be indicators of anthropogenic pollution were also found at elevated concentrations and all followed the order wells > springs > taps. This ordering coincides with the proximity of human influences to the water sources. Our results clearly establish an exposure pathway between anthropogenic activity and drinking water supplies, suggesting that the causative agent for BEN could result from surface contamination. 相似文献
560.