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111.
112.
Huan Liu Bei Yuan Bi Zhang Hongyun Hu Aijun Li Guangqian Luo Hong Yao 《Journal of Material Cycles and Waste Management》2014,16(1):101-107
Mercury from coal-fired utility boilers, as the largest atmospheric mercury emission source, imposes serious environmental risks and health concerns. In order to explore the possibility of reducing costs of activated carbon injection, we investigated the most promising mercury control technology, Hg0 removal using ZnCl2-impregnated adsorbents derived from sewage sludge. The results demonstrated that sludge-based adsorbents (SBAs) had fairly high mercury adsorption capacity over a wide range of temperatures (80–170 °C). Oxidizing atmosphere could improve the adsorption of Hg0 and weaken the inhibition of SO2 on mercury adsorption to some extent. NO exhibited no obvious impact on mercury removal performance. In addition, to clarify whether oxygen- or chlorine-containing functional groups attributed to good mercury adsorption capacity of SBAs, the oxygen-containing functional groups were removed using Boehm’s method, and a temperature-programmed decomposition desorption experiment was conducted. The results suggest that chlorine-containing functional groups played a significant role in the removal process of mercury from flue gas using SBAs. 相似文献
113.
Is an adjusted rhizosphere-based method valid for field assessment of metal phytoavailability? Application to non-contaminated soils 总被引:1,自引:0,他引:1
Fang J Wen B Shan XQ Lin JM Owens G 《Environmental pollution (Barking, Essex : 1987)》2007,150(2):209-217
Previously recommended rhizosphere-based method (RHIZO) applied to moist rhizosphere soils was integrated with moist bulk soils, and termed adjusted-RHIZO method (A-RHIZO). The A-RHIZO and RHIZO methods were systematically compared with EDTA, DTPA, CaCl2 and the first step of the Community Bureau of Reference (BCR1) methods for assessing metal phytoavailability under field conditions. Results suggested that moist bulk soils are equally suited or even better than rhizosphere soils to estimate metal phytoavailability. The A-RHIZO method was preferred to other methods for predicting the phytoavailability of Ni, Cu, Zn, Cd, Pb and Mn to wheat roots with correlation coefficients of 0.730 (P<0.001), 0.854 (P<0.001), 0.887 (P<0.001), 0.739 (P<0.001), 0.725 (P<0.001) and 0.469 (P<0.05), respectively. When including soil properties, other extraction methods were also able to predict phytoavailability reasonably well for some metals. Soil pH, organic matter and Fe-Mn oxide contents, and cation-exchange capacity mostly influenced the extraction and phytoavailability of metals. 相似文献
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115.
浙江北部海域春季浮游动物的群落结构研究 总被引:2,自引:0,他引:2
根据2007年春季在浙江北部海域所采集的浮游动物样品,对该调查海域浮游动物的种类组成、丰度、生物量和生物多样性进行了探讨,采用多元统计软件PRIMER 5分析了该海域浮游动物的群落结构。研究结果表明,调查海域共鉴定各类浮游动物62种、浮游幼虫12种,合计74种。经统计共有2种优势种,分别是中华哲水蚤(Calanus sinicus)和五角水母(Muggiaea atlantica)。浮游动物生物量和丰度的平面分布比较相似,主要分布在调查海域的东部和东南部,并存在着向东南方向呈递增的趋势,而在杭州湾内的值比较小。调查海域浮游动物生物多样性比较低,平均值为1.54。根据对本次调查获得的浮游动物群落结构的聚类分析,主要存在着两个生态类群,群落Ⅰ为沿岸低盐群落,群落Ⅱ为暖温带近海群落。 相似文献
116.
Melek Er Osman Tugay Mehmet Musa Özcan Deniz Ulukuş Fahad AL-Juhaimi 《Environmental monitoring and assessment》2013,185(6):5193-5198
Antioxidant capacity, total phenol and mineral contents of aerial parts of sage belonging to some Salvia species were established. The lowest and highest antioxidant values of Salvia dichroantha Stapf and Salvia heldreichiana Boiss. ex Benth. extracts were found as 73.855 and 80.207 mg GAE/g, respectively. While the highest total phenol was established in Salvia tomentosa Mil. (13.316 mg GAE/100 ml), the lowest level was found in Salvia halophila Hedge (6.168 mg GAE/100 ml). While K contents of plants changed between 14,518 and 24,171 mg/kg, Ca contents ranged between 12,402 and 18,553 mg/kg. P and Mg contents were found low compared with K and P values of plants. Mg content was changed between 2,118 and 2,914 mg/kg; the mean was calculated as 2,496 mg/kg. P contents of plants were determined between 1,385 to 1,910 mg/kg. As a microelement, Fe was found at the highest level. Fe contents of plants were found between 179 and 782 mg/kg. 相似文献
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118.
水中草甘膦和氨甲基膦酸的柱前衍生-液相色谱方法研究 总被引:1,自引:0,他引:1
建立柱前衍生-液相色谱-荧光检测法同时测定水中草甘膦和氨甲基膦酸的方法。水样经芴甲氧羰酰氯衍生化后取上清液进样,采用ODS C18柱,以水(5 mmol/L乙酸铵)-乙腈作为流动相进行梯度洗脱,采用荧光检测器进行检测。实验通过加入柠檬酸三钠,解决了实际水样中金属阳离子的干扰问题。草甘膦和氨甲基膦酸在一定范围内线性良好(r=0.997 3~0.999 0),回收率为92.2%~102%,相对标准偏差为4.3%~8.5%,方法检出限为1.29μg/L和1.84μg/L。 相似文献
119.
120.
为解决宁夏电网同塔双回线路存在的零序环流问题,采用电力系统全数字实时仿真方法,对同塔双回线路零序环流进行仿真分析,结果表明:同塔双回不换位导线内零序环流大小与相序布置方式有关,通过改变相序布置可减小零序环流幅值。 相似文献