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磷块岩对二价镉离子的吸附性能研究 总被引:12,自引:0,他引:12
用宜昌、海口、保康等地磷块岩对水溶液中镉离子的吸附实验结果表明,影响吸附效果的主要因素有介质的酸度,作用时间,初始Cd^2 浓度和样品用量。在pH=6,作用时间为15min,初始Cd^2 浓度为30mg/L的实验条件下,宜昌硅质磷块岩对镉离子的去除率可达98%,去除容量为4.5mg/g(样品),吸附效果最好,海口的效果次之,而保康钙质磷块岩的效果最差。上述差异可能与这些磷块岩的矿物成分和结晶化学特性之间的差异有关。 相似文献
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通过对细粒天然磁铁矿的穆斯堡尔谱研究和对华北冀东油田第三系砂岩样品的磁性载体成分、成因、剩磁稳定性和特征剩磁方向的研究,探讨了烃类的化学吸附作用与岩石剩磁稳定性之间的关系,烃类的化学吸附作用能够降低岩石的剩磁稳定性,因此,可能会导致产生次生剩磁。这一认识为客观全面地了解各种次生剩磁的成因、研究重磁化现象的时空分布规律,进而为探索新的磁清洗方法和应用岩石磁学方法研究含油气地层的地质问题提供了新的思路 相似文献
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Maoxu ZHU Haihua WANG Xin JIANG 《中国地球化学学报》2006,25(B08):94-95
Phosphate is one of the important nutrients for plant growth. In acidic and highly weathered soils, phosphate is ready to adsorb on Al and Fe oxides and transform into sparsely soluble Fe-P and Al-P solid phases, greatly reducing phosphate bioavailability. Aluminum and iron oxides in soils are important sinks for both phosphate and fluoride. In acidic soils, fluoride adsorption can dramatically facilitate dissolution of Al- and Fe-containing phases, which may influence the distribution and migration of both pollutants and nutrients including phosphate. To date, little information is available on mutual effects of fluoride and phosphate in fluoride-contaminated acidic soils. The objective of this study is to evaluate mutual effects of fluoride and phosphate on their adsorption/desorption in red soil, collected fi'om Yingtan, Jiangxi Province, China, using a batch equilibrium method. The following results and conclusions were obtained. In heavily fluoride-contaminated soils, the adsorption of both fluoride and phosphate decreases with an increase in solution pH. Phosphate adsorption decreases progressively with increasing concentration of fluoride, suggesting that fluoride competes with phosphate for adsorption sites. 相似文献
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Shinji Sakurai Yoko Fujikawa Masami Fukui Masumi Kakumoto Tatsuhide Hamasaki Masataka Sugahara Yuko Abe Takahisa Shinjo 《中国地球化学学报》2006,25(B08):118-118
Livestock wastes applied to agricultural land are potential sources of steroidal hormones (estradiol (E2), estrone (E1), and estriol (E3)) that can adversely affect the aquatic ecosystem as endocrine disruptors. But the effects of plants on the fate of estrogen in the environment are not clearly known. In the present report, the behavior of E1, E2 and E3 added to the rhizospheric soil in various concentrations and its effect on plant growth were examined by estrogen batch sorption test, plant pot test and estrogen extraction test. Trifolium repens was grown on the soil spiked with E2 or a mixture of E1, E2 and E3. Pots without plant were prepared as controls. All pots were watered in 50 ml dose almost every day, and the rhizosheric soil and plant body were collected 7, 19, 26, 33 days after planting. The soil was sequentially extracted with Milli-Q water, and methanol / 1M acetic acid solvent followed by methanol wash at the solid to liquid ratio of 1 : 4 (g/mL). Extracts were analyzed for El, E2 and E3 using a Shimadzu GCMS-QP5050. Plant dry weight (4 hours, 105 ℃) was measured as an indicator of plant growth. In batch sorption tests, E1 and E2 concentrations in the liquid phase significantly decreased within 24 hours after the addition of estrogen. The sum of methanol / 1M acetic acid extractable E 1 and E2 in the soil decreased to half of the initial added amount within 7 days. Reduction in total estrogenic activity of the soil extracts (estimated as 0.01CE1+CE2+0.1CE3 where CE1, CE2 and CE3 are respective El, E2 and E3 concentrations per unit soil weight) continued for 1 month due to slow oxidation of E2 to E1. Desorption of E2 from soil during the pot experiment was higher than expected from the sorption experiment. 相似文献
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Shengli WANG 《中国地球化学学报》2006,25(B08):124-125
Heavy metals in soils may adversely affect environmental quality. This paper studied the influence of copper concentration, pH, temperature, and the ratio of solid to solution on the desorption of Zn in kaolin from Suzhou, China in a background solution of 0.01M CaC12 by batch extraction experiments. At 0, 5, 50, 100 mg/L Cu concentrations, for each 0.5, increase in pH between about 1.80 and 3.04 percent desorption decreasing by 3.80%, 13.87%, 9.97%, and 7.65%, respectively. The pH 50 ( pH at 50% Zn desorption) was found to follow the sequence of Cu (5mg/L, pH 50=2.60). 相似文献
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Xiangcan JIN Xia JIANG Dongmei LIU 《中国地球化学学报》2006,25(B08):164-164
Sediment from three different trophic states (Meiliang Bay, Xukou Bay and Gonghu Bay) in spring, summer, autumn and winter were collected and analyzed in Taihu Lake. At the same time, seasonal variations in adsorption/desorption equilibrium were investigated with corresponding sediments from these three trophic states, including adsorption efficiency, adsorption/desorption equilibrium concentration and equilibrium adsorption quantity. Variations of TP and P fractions' concentrations in the initial and end of adsorption experiment were also documented in order to find the most active P fractions. The following conclusions were obtained: (1) Concentrations of total phosphorus (TP) and its fractions in the sediments were coincided with the trophic state of corresponding overlying water, Meiliang Bay〉Gonghu Bay〉Xukou Bay. The Meiliang Bay located in the north of Taihu Lake is in the eutrophic state and belong to alga-type lake; the Xukou Bay located in the northeast of Taihu Lake is relatively clean lake region; the Gonghu Bay is located in the east of Taihu Lake is in the meso-trophic state. Fe-P concentrations in the Meiliang Bay, Gonghu By and Xukou Bay account for 35.1%-70.9%, 19.6%-26.8%, 16.5%-34.3% of TP, Ca-P account for 20.6%-43.7%, 40.7%-45.0%, 23.0%-41.1% and OP accounts for 15.3%-20.2%, 28.4%-37.4%, 23.6%-54.3%, which changes obviously in different seasons. Fe-P is the major fraction in the eutrophic lake region, which is significantly correlated with the TP concentrations. (2) Adsorption and desorption processes in these three lake regions varied with season. 相似文献