4篇
您的检索式：作者名="Chengnan Ma"
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| 1 | Application of oxidation-reduction potential as a controlling parameter in waste activated sludge hydrolysis显示文摘 | CHANG Chengnan MA Yingshih LO Chunwei | 2002 | Chemical Engineering Journal2002，90，： | 1 |
| 2 | Application of oxidation-reduction potential as a controlling parameter in waste activated sludge hyhdrolysis显示文摘 | Chang Chengnan Ma Y S Lo C W | 2002 | Journal of the Chinese Institute of Chemical Engineers2002，90，3： | 1 |
| 3 | Adsorption and desorption of Cd in reclaimed soil under the influence of humic acid:characteristics and mechanisms显示文摘Exogenous humus can change the content and migration activity of cadmium(Cd)in soil.Humic acid(HA)is an important soluble humus component in soil.In order to explore the relationship between cadmium pollution mechanism and ecological environment of humic acid in reclaimed soil,the characteristics of humic acid adsorbing cadmium in alkaline conditions were studied.This study employed reclaimed soil from the Huainan mining area,China.The adsorption and desorption characteristics as well as influence mechanisms on the heavy metal cadmium(Cd)were explored under the influence of HA.The results show that:(1)When Cd concentration was low(0.2–10 mg/L),HA had little effect on Cd adsorption and desorption in reclaimed soil.When the Cd concentration was high(15–80 mg/L),HA had a great influence on the adsorption and desorption of Cd in reclaimed soil.The addition of HA can inhibit the adsorption of Cd by reclaimed soil and effectively improve the desorption capacity of Cd by reclaimed soil.(2)The kinetic curves of Cd adsorption and desorption of reclaimed soil with added HA show that both processes(adsorption and desorption)include two stages:rapid reaction and slow reaction.The adsorption of Cd by reclaimed soil under the influence of HA was 18.18%lower than that of normal reclaimed soil,and the increase of Cd desorption was 50.29%.(3)The factors affecting the adsorption and desorption of Cd in the soil were analyzed with gray theory,and their importance can be ordered as follows:Cd concentration>HA concentration>pH>temperature.Considering the influence of HA,a multi-factor coupling function model of adsorption and desorption of Cd in soil is established.This model provides theoretical guidance for the scientific prediction and evaluation of Cd environmental pollution risks in soil and will be useful for developing a new solution for engineering remediation of high concentration Cd contaminated soil. | Yonghong Zheng Zhiguo Zhang Yongchun Chen Shikai An Lei Zhang Fangling Chen Chengnan Ma Weiqing CAi | 2022 | International Journal of Coal Science & Technology2022，9，1： | 1 |
| 4 | Quantification of pesticide residues on plastic mulching films in typical farmlands of the North China显示文摘Plastic debris as new pollutants attracts much attention in the recent years.The plastic mulching films is one of the most important plastic debirs source in the environment.The aim of this work was to investigate the current status of pesticide residues on the plastic mulching films.Based on the QuEChERS method,multi-residue methods for detection of pesticide residues with gas chromatography tandem mass spectrum(GC-MS)and high performance liquid chromatography tandem mass spectrum(HPLC-MS)were developed for the analysis of the pesticides residues in plastic film and soil samples from Tianjin,Hebei and Shandong.The total concentrations of pesticide residues were in the range of 86.4-22213.2 ng/g in plastic film debris,which was about 20 times higher than that in soil(9.3—535.3 ng/g).Residual level of pesticides varied greatly in different samples.The historical usage and recent application of pesticides were the main sources for pesticide residues on plastic films and soil.In short,plastic mulching films could act as a sink for pesticides in farmland and the ubiquitous pesticide residues on plastic films should draw more attention. | Baoyuan Guo Jiao Meng Xinyu Wang Chengnan Yin Weiyu Hao Baiwen Ma Zhang Tao | 2020 | Frontiers of Environmental Science & Engineering2020，14，1： | 0 |
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