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排序方式: 共有146条查询结果,搜索用时 265 毫秒
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水中LAS的光催化氧化处理研究 总被引:4,自引:1,他引:3
本文研究了三聚磷酸钠(STPP)浓度变化和温度变化条件下,对水中直链十二烷基苯磺酸钠(LAS)光催化氧化降解的影响,并根据动力学研究的结果,充分说明了造成上述影响的原因。 相似文献
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全氟辛烷磺酸盐在天然水体沉积物中的吸附-解吸行为 总被引:14,自引:0,他引:14
通过平衡振荡试验,探讨了沉积物的理化性质(总有机碳含量、粒度、阳离子交换容量、比表面积)、离子强度和pH值对全氟辛烷磺酸盐(PFOS)吸附-解吸行为的影响.结果表明,在中性环境中PFOS在水和沉积物中有机质之间的分配作用是影响其吸附行为的重要机制,分配系数Kd与沉积物中总有机碳含量呈显著正相关(r=0.96,p<0.01,n=15).随着离子强度的增加,盯OS在沉积物中的吸附量明显增大,解吸滞后现象更加明显.pH的影响在酸性和碱性条件下(pH 4~8.5)呈现出不同的特点,在酸性条件下随pH值增加,PFOS在沉积物中的吸附量减少;在pH接近中性时达到最小值;在碱性条件下随pH增加,吸附量增加. 相似文献
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滇池烷基苯磺酸钠的分布,降解及对鲤鱼的危害效应 总被引:3,自引:0,他引:3
研究表明滇池水中LAS含量为0.018~0.029mg/l,局部水域达0.2~0.7mg/l;ABS强烈地吸附在底质中,以湖体呈曲线分布,平均含量高达0.43mg/kg,16h内LAS动态降解率比静态降解率高2.2倍,不同浓度的LAS对滇池鲤鱼的结果表明,5~35mg/l浓度水中,溶解氧下降,pH值升高,产生急性危害效应,半致死浓度48TL50为3.0mg/l,完全浓度为0.3mg/l。当LAS含 相似文献
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Sediment-water distribution of perfluorooctane sulfonate (PFOS) in Yangtze River Estuary 总被引:2,自引:0,他引:2
Analysis of Perfluorooctane sulfonate (PFOS) distribution in water and sediment in Yangtze River Estuary showed that the estuary was a sink for PFOS. Salinity was an important parameter in controlling the sediment-water interactions and the fate or transport of PFOS in the aquatic environment. As the salinity (S‰) increased from 0.18 to 3.31, the distribution coefficient (Kd) between sediment and water linearly increased from 0.76 to 4.70 L g−1. The study suggests that PFOS may be carried with the river water and transported for long distances before it reaches to the sea and largely scavenged to the sediment in the estuaries due to the dramatic change in salinity. 相似文献
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A rapid and high-throughput quantum dots bioassay for monitoring of perfluorooctane sulfonate in environmental water samples 总被引:1,自引:0,他引:1
Zhang J Wan Y Li Y Zhang Q Xu S Zhu H Shu B 《Environmental pollution (Barking, Essex : 1987)》2011,159(5):1348-1353
Currently HPLC/MS is the state of the art tool for environmental/drinking water perfluorooctane sulfonate (PFOS) monitoring. PFOS can bind to peroxisomal proliferator-activated receptor-alpha (PPARα), which forms heterodimers with retinoid X receptors (RXRs) and binds to PPAR response elements. In this bioassay free PFOS in water samples competes with immobilized PFOS in ELISA plates for a given amount of PPARα-RXRα. It can be determined indirectly by immobilizing PPARα-RXRα-PFOS complex to another plate coated with PPARα antibody and subsequent measuring the level of PPARα-RXRα by using biotin-modified PPARα-RXRα probes-quantum dots-streptavidin detection system. The rapid and high-throughput bioassay demonstrated a detection limit of 2.5 ng L−1 with linear range between 2.5 ng L−1 and 75 ng L−1. Detection results of environmental water samples were highly consistent between the bioassay and HPLC/MS. 相似文献
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Somrutai Poothong Suwanna Kitpati Boontanon Narin Boontanon 《Journal of environmental science and health. Part. B》2013,48(10):830-835
This research aimed to optimize the extraction method parameters for sample pretreatment and determine the levels of perfluorooctane sulfonate (PFOS) and perfluorooctanoic acid (PFOA) contamination in food packaging made of paper. Techniques used were pressurized liquid extraction (PLE) followed by liquid chromatography coupled with tandem mass spectrometry (LC-MS/MS). Influence parameters of PLE were carefully evaluated for extracted concentration of samples in low level (ng g?1). The study found that the optimal conditions for PLE were 30 min static extraction time with a flush volume of 100% cell volume and one extraction cycle at 80°C and 1,000 psi. The extraction technique validated the absolute recovery from PFOS and PFOA fortified control samples at three different levels (5, 50, and 200 ng g?1), with seven repeats at each fortification level. The average recoveries were 79% or higher, with relative standard deviation (RSD) less than 11%. Optimization of the PLE method was established based on recovery data, accuracy, precision, and repeatability of the method. Using optimal PLE technique, PFOS and PFOA were extracted from 34 food-packaging samples collected in Thailand. PFOS and PFOA were detected in all kinds of collected samples, with average concentrations of 4.89 and 2.87 ng g?1, respectively. The concentrations of PFOS and PFOA were highest in fast-food container samples: 36.99 and 9.99 ng g?1, respectively. 相似文献