摘要
土壤镁素的吸附解吸行为影响镁的生物有效性,对维持土壤正常的生态效应具有重要意义。由于磷石膏中的可溶性物质可影响土壤镁的吸附解吸行为,采用静态吸附的方式,研究磷石膏中可溶性物质对黄壤镁吸附解吸的影响。结果表明:水洗磷石膏土样的镁吸附量与磷石膏土样相比,其吸附量提高了5.34%~6.99%;磷石膏土样的镁解吸量与水洗磷石膏土样相比,其解吸量提高了7.42%~12.43%。CaSO_(4),SO_(4)^(2-),H_(2)PO_(4)-和F-显著影响黄壤pH、有机质和游离氧化铁。CaSO_(4)对黄壤镁吸附起抑制作用;SO_(4)^(2-)、H_(2)PO_(4)-和F-对黄壤镁吸附起促进作用。CaSO_(4)对黄壤镁解吸起促进作用,SO_(4)^(2-)、H_(2)PO_(4)-和F-对黄壤镁解吸起抑制作用,表明单一成分下的CaSO_(4)可降低黄壤对镁的吸附作用,而SO_(4)^(2-)、H_(2)PO_(4)-和F-则增强黄壤对镁的吸附作用。与原土相比,磷石膏洗液土样的吸附量从356.8 mg/kg降至300.4 mg/kg,解吸量从59.8 mg/kg增至84.7 mg/kg,表明磷石膏洗液的加入可提高黄壤镁的有效性。
The adsorption and desorption behavior of soil magnesium affects the bioavailability of magnesium,which is of great sig-nificance for maintaining the normal ecological effects of the soil.Since the soluble substances in phosphogypsum can affect the ad-sorption and desorption behavior of magnesium in soil,the effect of soluble substances in phosphogypsum on the adsorption and de-sorption of magnesium in yellow soil was studied by static adsorption.The results show that the magnesium adsorption capacity of washed phosphogypsum soil sample is 5.34%~6.99%higher than that of phosphogypsum soil sample;compared with washed phos-phogypum soil smle,the desopion of maesium inpospoypsusoil ameinreased by 742%.43%.Ca H_(2)PO_(4) and F'significantly affect the pH,organic matter,and free iron oxide of yellow soil.CaSO_(4) inhibits the adsorption character-istics of magnesium in yllow soil;SO_(4),H_(2)PO_(4) and F promote the adsorption of magnesium in yellow soil.CaSO_(4) has an inhibitory effect on magnesium adsorption in yllow soil;SO_(4)^(2-),H_(2)PO_(4) and F promote the adsorption of magnesium in yellow soil.CaSO_(4) pro-motes the desorption of magnesium in yellow soil,while SO_(4)^(2-),H_(2)PO_(4) and F inhibit the desorption of magnesium in yellow soil.This indicates that a single component of CaSO_(4) can reduce the adsorption of magnesium in yellow soil,while SO_(4)H,PO_(4) and F enhance the adsorption of magnesium in yellow soil.Compared with the original soil,the adsorption amount of phosphogypsum lotion soil sample decreased from 356.8 mg/kg to 300.4 mg/kg,and the desorption amount increased from 59.8 mg/kg to 84.7 mg/kg,indicating that the addition of phosphogypsum lotion could improve the availability of magnesium in yellow soil.
作者
胡昌荣
易芸
田娟
陈文兴
曹建新
HU Chang-rong;YI Yun;TIAN Juan;CHEN Wen-xing;CAO Jian-xinn(School of Chemistry and Chemical Engineering,Guizhou University,Guiyang 550025,China;Guizhou Key Laboratory for Green Chemical and Clean Energy Technology,Guiyang 550025,China;Guizhou Research Institute of Chemical Industry,Guiyang 550002,China)
出处
《化学研究与应用》
CAS
北大核心
2023年第11期2693-2702,共10页
Chemical Research and Application
基金
国家重点研发计划(2018YFC1900206-2)资助
贵州省科技计划项目(黔科合平台人才[2019]5409)资助
贵州省科技计划项目(黔科合服企[2018]4011)资助。
关键词
磷石膏
可溶性物质
黄壤
镁
吸附
解吸
phosphogypsum
soluble substances
yellow soil
magnesium
adsorbent
desorption
