摘要
在淮南潘谢采煤沉陷区水域的潘集(PJ)、顾桥(GQ)、谢桥(XQ)各选一研究站点,研究区域水化学条件下溶液离子组分对表层沉积物磷(P)吸附特征的影响.等温吸附实验分别在纯水、NaCl、CaCl2、NaHCO3和NaHCO3+CaCl2共5组环境溶液中进行,其中前4组设置为探讨各组分对P吸附的单独作用,最后1组代表各组分的综合作用.结果表明,环境溶液设置对P的吸附特征有重要影响,Ca2+能显著增强沉积物对P的吸附潜能,而弱碱性环境(NaHCO3组)则不利于沉积物对P的吸附,实际水化学条件下的作用则表现为二者的综合,但Ca2+增强作用要显著大于碳酸盐弱碱性缓冲体系的弱化作用.3个站点沉积物P的零吸附平衡浓度(EPC0)的均值分别为0.059、0.032和0.040 mg·L-1,总体上有向水体释磷的趋势,PJ站点释放潜能要高于GQ和XQ站点,与研究水域营养水平密切相关.由于特殊的沉积环境,研究水域P释放潜能比富营养化程度较高的湖泊要弱,接近于营养水平较低的水体.
Three research sites of subsidence waters, including Panji （PJ） , Guqiao （GQ） and Xieqiao （XQ） located in the Huainan ＂Panxie＂ Mine Area have been selected to address their phosphorus （P） adsorption behavior in the sediments considering the sitespecific regional water chemistry. The P isothermal adsorption was measured in pure water and four different types of ion solutions, prepared through additions of sodium chloride （ NaCI）, calcium chloride （ CaC12 ）, sodium bicarbonate （ NaHCO3 ）, and a mixture of sodium bicarbonate and calcium chloride （NaHCO3 ＋ CaC12） . The first four settings were studied to analyze the individual impact of each solution on P adsorption while the last one was to study their combined effect. In general, Ca2＋ could enhance P adsorption on sediment surfaces while weakly alkaline conditions caused by bicarbonates were unfavorable for its adsorption. As a comprehensive effect, the positive effect of the former was greater than the negative effect of the latter. The zero equilibrium phosphorus concentrations （ EPC0 ） in the three sites were 0. 059, 0. 032 and 0. 040 mg.L-1, respectively, showing trends of P releasing to the overlying water column. The site of PJ showed greater P releasing potential than those at the GQ and XQ sites, probably due to its higher nutrient level. Overall, P releasing risks in the researched sediments are weaker than those in eutrophic lakes, while they are very similar to lakes with lower trophic levels, because of their unique sedimentary environments from inundated agricultural soils.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2013年第10期3894-3903,共10页
Environmental Science
基金
国家自然科学基金项目(41202242)
安徽省级高校自然科学研究重点项目(KJ2011A084)
教育部留学回国人员科研启动基金项目(第45批)
关键词
煤矿
沉陷区
沉积物
磷
水化学
等温吸附
coal mines
subsidence areas
sediments
phosphorus
water chemistry
isothermal adsorption
