Effects of field application of phosphate fertilizers on the availability and uptake of lead, zinc and cadmium by cabbage (Brassica chinensis L.) in a mining tailing contaminated soil

A field trial was conducted to evaluate the reduction of bioavailability of heavy metals including lead (Pb), zinc (Zn) and cadmium (Cd) in a soil contaminated by mining tailings in Shaoxing, Zhejiang, China. Three commercial phosphate (P) fertilizers including phosphate rock (PR), calcium magnesium phosphate (CMP), and single superphosphate (SSP) were applied to the plot at three P application rates, 50, 300, and 500 g/m2 with 9 treatments and control (CK). Plants, water soluble and exchangeable (WE) extra...     

Urea hydrolysis and recovery of nitrogen and phosphorous as MAP from stale human urine

Laboratory-scale tests for magnesium ammonium phosphate(MAP)precipitation following urea hydrolysis of human urine were conducted using orthogonal experiment design.The effects of initial pH,temperature and the volumetric ratios of stale urine to fresh urine,on urea hydrolysis in urine were studied to determine the final hydrolysis time to recover most nitrogen from separated human urine by MAP.With a volumetric ratio of stale to fresh urine>10% and at temperature≥20℃,urea hydrolysis could be completed i...     

Study on superoxide and hydroxyl radicals generated in indirect electrochemical oxidation by chemiluminescence and UV-Visible spectra

The generation and transformation of radicals on the cathode of indirect electrochemical oxidation were studied by chemilumines- cence(CL)and UV-Visible spectra in the reactor with a salt bridge that connected the separated chambers.The CL intensity of 4×10~(-9)mol/L luminol on the cathode with bubbling oxygen was about seven times that of the intensity without it,which was because of the generation of reactive oxygen species(ROS).The existence of ROS,especially the generation of the superoxide radical,c...     

Effects of dissolved organic matter from sewage sludge on sorption of tetrabromobisphenol A by soils

Sorption of tetrabromobisphenol A (TBBPA) by soil influences its fate and transport in the environment. The presence of dissolved organic matter (DOM) may complicate the sorption process in soil. The effects of DOM from sewage sludge on TBBPA sorption by three soils were investigated using batch equilibration experiments in the study. DOM was observed to be sorbed on the soils and the isotherms could be fitted by the Langmuir model. The effects of DOM on TBBPA sorption were dependent on the characteristics ...     

Effect of inorganic carbon on anaerobic ammonium oxidation enriched in sequencing batch reactor

The present lab-scale research reveals the enrichment of anaerobic ammonium oxidation microorganism from methanogenic anaerobic granular sludge and the effect of inorganic carbon(sodium bicarbonate)on anaerobic ammonium oxidation.The enrichment of anammox bacteria was carried out in a 7.0-L sequencing batch reactor(SBR)and the effect of bicarbonate on anammox was conducted in a 3.0-L SBR.Research results,especially the biomass,showed first signs of anammox activity after 54 d cultivation with synthetic w...     

Preparation of colloidal gold immunochromatography strip for detection of methamidophos residue

Methamidophos (Met) is a broad spectrum organophosphorus insecticide and acaricide.Even a trace of its residue is harmful to humans and many animals.In this study,the synthesis and identification of colloidal gold particles and antibody-colloidal gold conjugates were performed,and the preparation of colloidal gold immunochromatography strip was conducted for detection of Met residue.The size of colloidal gold particles was checked using a transmission electron microscope (TEM).The formation of antibody-coll...     

GPSM(1)灰色模型在大气降水酸度预测中的应用

介绍了ＧＰＳＭ（１）灰色模型的建模思想,并将其成功地应用于某地大气降水酸度预测,其结果与实际情况一致性很好,表明ＧＰＳＭ（１）模型预测大气降水酸度是可行的     

乙醛对鱼类毒性的实验研究

介绍了实验室乙醛对鲢鱼幼鱼的急性毒性。试验结果表明,乙醛对鲢鱼幼鱼的急性毒性４８ｈＬＣ５０为１４６１８ｍｇ／Ｌ,其安全浓度为１４６２ｍｇ／Ｌ。     

催化光度法测定痕量铬(Ⅵ)的研究

基于在稀磷酸介质中,铬（Ⅵ）对溴酸钾氧化结晶紫有催化作用,提出了测定痕量铬（Ⅵ）的新催化光度法,检出限为２５×１０－９ｇ／Ｌ,线性范围为０２～４０μｇ／２７ｍｌ。应用于测定地面水及地下水的铬（Ⅵ）,结果满意。     

回流法测定废水中氯化物的改进及排除B_r~-、I~-等多种干扰作用的研究

本文在常规Ｖｏｌｈｏｒｄ回滴法测定氯化物中,加入一定量聚（Ｉ）〔１〕防凝聚剂,可以防止经典法不可避免的复分解反应,保证测定结果的准确性;同时研究了通过控制不同酸度、温度及加入不同类型试剂等简便化学手段除去十多种常见干扰物质的方法,尤其能有效除去现有各方法中最为棘手、难度较大的同族元素Ｂ－ｒ、Ｉ－等干扰,方法简便、快速、效果显著,在工业废水的测定中优于其它方法。