Adsorption of β-naphthalenesulfonic acid/sulfuric acid from their solution by weakly basic resin: equilibrium

Experiments for single and bisolute competitive adsorption were carried out to investigate the adsorption behavior of β-naphthalenesulfonic acid(NSA) and sulfuric acid (H2SO4) from their solution at 25℃ onto weakly basic resin D301R. Adsorption affinity of sulfuric acid on D301R was found to be much higher than that of NSA. The data of single-solute adsorption were fitted to the Langmuir model and the Freundlich adsorption model. The ideal adsorbed solution theory(lAST) coupled with the single-solute adsorption models were used to predict the bisolute competitive adsorption equilibria. The lAST coupled with the Langmuir and the Freundlich model for sulfuric acid and NSA, respectively, yields the favorable representation of the bisolute competitive adsorption behavior.     

The stem-II acid deposition and photochemical oxidant model—II. A diagnostic analysis of mesoscale acid deposition

The MesoSTEM model is used to analyse data obtained during the Mesoscale Acid Deposition Study. The Mesoscale Acid Deposition Study was designed to investigate acid deposition on the urban-suburban scale by sampling well defined frontal storms around the city of Philadelphia using a surface based network. The MesoSTEM model was developed to provide diagnostic analysis of these data. The mesoSTEM model is a combination of the Mesoscale Atmospheric Simulation System (MASS) predictive mesoscale dynamic meteorological model and the STEM-II model, a three-dimensional Eulerian acid deposition model. The MesoSTEM model is described in this paper and applied to the analysis of the 2 May 1985 storm. Elevated sulfate and nitrate deposition is predicted downwind of the major source areas and nitrate deposition exceeds that for sulfate. However, much of the NO_x and SO_x emitted on the mesoscale escapes the storm and becomes available for long-range transport and subsequent deposition.     

Wet air oxidation treatment of H acid wastewater

１ＩｎｔｒｏｄｕｃｔｉｏｎＨａｃｉｄｍｏｎｏｓｏｄｉｕｍｓａｌｔ（４ａｍｉｎｏ５ｈｙｄｒｏｘｙ２，７Ｎａｐｈｔｈａｌｅｎｅｄｉｓｃｕｌｆｏｎｉｃａｃｉｄｍｏｎｏｓｏｄｉｕｍｓａｌｔ，ｈｅｒｅｉｎａｆｔｅｒｒｅｆｅｒｅｅｄｔｏａｓ“Ｈａ...     

Photodegradation of α-naphthaleneacetic acid in aqueous solution

Ｉｎｔｒｏｄｕｃｔｉｏｎα ｎａｐｈｔｈａｌｅｎｅａｃｅｔｉｃａｃｉｄ (ＮＡＡ)ｉｓａｎｉｍｐｏｒｔａｎｔｐｌａｎｔｇｒｏｗｔｈｒｅｇｕｌａｔｏｒｕｓｅｄｎｏｔｏｎｌｙｔｏｐｒｅｖｅｎｔｔｈｅｐｒｅｈａｒｖｅｓｔｄｒｏｐｏｆａｐｐｌｅｓｂｕｔａｌｓｏａｓａｆｒｕｉｔｔｈｉｎｎｉｎｇａｇｅｎｔ (Ｗｏｒｔｈｉｎｇ ,1991) .ＭｕｃｈｒｅｓｅａｒｃｈｗｏｒｋａｂｏｕｔｔｈｅｅｆｆｅｃｔｏｆＮＡＡｏｎｐｌａｎｔｔｉｓｓｕｅｓ(Ｓｐｅｅｒ,1993;Ｈｉｄｅｙｏｓｈｉ,1993;Ｐｒａｓｄ ,1994 ) ,ｐｌａｎｔｇｒｏｗｔｈａ…     

Terephthalic acid wastewater treatment by using two-stage aerobic process

１ＩｎｔｒｏｄｕｃｔｉｏｎＴｈｅｔｅｒｅｐｈｔｈａｌｉｃａｃｉｄ（ＰＴＡ）ｗａｓｔｅｗａｔｅｒｃｏｎｔａｉｎｓｔｅｒｅｐｈｔｈａｌｉｃａｃｉｄ（ＴＡ），ａｃｅｔｉｃａｃｉｄａｎｄｍｅｔｈｙｌａｃｅｔａｔｅ，ａｎｄｓｏｏｎ（Ｔａｂｌｅ１）．ＰＴＡｗａｓ...     

Sensitivity of soils to acid rain in South China

This paper deals with the sensitivity of soils to acid rain in 5 provinces, South China. Based on field work and literature, and taking soil pH, CEC, and the types of residua into account, the authors classified the sensitivity into 4 categories: highly sensitive, sensitive, slightly sensitive, and non-sensitive. By overlapping the maps of soil pH, CEC, and types of residua, the map of soil sensitivity in South China has finally resulted.The authors try to summarize the regularity of soil sensitivity to acid rain in this area. The sensitivity of different soil types in the studied area has also discussed.The seriousness and its prospects of acid rain in this area have been pointed out in order to draw the attention of relevant authorities.     

Influence of acid deposition on atmospheric corrosion of zinc

Site exposure tests both open and sheltered have been carried out in acid deposition area in Southwest China. Results from six sites show that acid deposition exerts a great influence on atmospheric corrosion of Zn, and it is more serious in wet condition. Basically, Zn corrosion is directly proportional to time of exposure. While SO2 is the main pollutant of the atmosphere environment, Zn corrosion has a linear relationship to SO2 depositing rate and a hyperbolic to rain pH value.Observations by SEM, EDAX and X-ray diffraction show that under sheltered exposure condition, the corrosion products of Zn in heavy acid deposition area principally are sulphates.Based on the corrosion rates measured, the working life of galvanized steel can be predicated.     

Effects of acid deposition on forests in south China

１ＩｎｔｒｏｄｕｃｔｉｏｎＷｉｔｈｔｈｅｆａｓｔｇｒｏｗｉｎｇｏｆｍｏｄｅｒｎｉｎｄｕｓｔｒｙａｎｄｓｈａｒｐｌｙｉｎｃｒｅａｓｉｎｇｏｆｅｎｅｒｇｙｃｏｎｓｕｍｐｔｉｏｎｐｒｉｍａｒｉｌｙｃｏａｌ，ａｉｒｐｏｌｕｔｉｏｎａｎｄａｃｉｄｄｅｐｏｓｉｔ...     

Control strategy for sulfur dioxide and acid rain pollution inChinaa

Several factors, namely, coal-dominated primary energy mix, extensive economic development mode, inefficient energy utilization, end the imperfect environmental regulations, result in the serious urban sulfur dioxide pollution end large-scale sulfatetype acid precipitation in China. In 1995, China's sulfur dioxide emissions reached 23.70 Mt, and the areas affected by acid rain accounted for 40% of the territory. Chinese government accords considerable importance to the sulfur dioxide end acid rain contamination. New sets of environmental friendly policies have been promulgated. But enforcement of laws and regulations on SO2 emissions need to be further improved and broadened, especially those respond to market conditions. This paper focuses particular attention on the analysis of strategy, policies, and national actions which had or should be taken against sulfur dioxide emissions nationwide to achieve the environmental targets, on the basis of which gives the technical options in future.     

Effects of acid rain on forest ecosystem in Southwestern China

The study of effects of acid rain in Southwestern China on forest ecosystems .has been inrestigated since 1984. The results have shown that the ecosystem of Pinus massoniana forest has been damaged severely by acid rain. Comparing the areas where the annual mean pH value is lower than 4.5 with that higher than 4.5, the productivity of the ecosystems decreased 50 percent. Both the percentages of the green leaves and the content of chlorophyll cut down; the acidity of soil increased a bit and the fertility showed the tendency to lower. The microbial population components in surface soil were changed and the total number of soil microbes reduced from 63.5 to 92.6 percent. Besides the direct effects of acid rain, the insect pest, especially, Blastophagus piniperdoz and Monochamus galloprovincialis, seized the opportunity to enter and reproduce in it so as to aggravate the forest dieback of P.massoniana in the areas where the annual average pH value is lower than 4.5.Additionally, the simulation study on the     

Solid components and acid buffering capacity of soils in South China

ＳｏｌｉｄｃｏｍｐｏｎｅｎｔｓａｎｄａｃｉｄｂｕｆｅｒｉｎｇｃａｐａｃｉｔｙｏｆｓｏｉｌｓｉｎＳｏｕｔｈＣｈｉｎａＱｉｕＲｏｎｇｌｉａｎｇ，ＷｕＱｉｎｇ，ＺｈａｎｇＹｕｎｎｉＤｅｐａｒｔｍｅｎｔｏｆＥｎｖｉｒｏｎｍｅｎｔａｌＳｃｉｅｎｃｅ，Ｚｈｏ...     

Charac teristics of acid mine drainage of Dexing C opper Mine

This work aim s at the characteristics of acid mine drainage of Dexing Copper Mine On the basis of the results of observation and analysis of samples collected in situ，it is shown that the characteristics of the acid water are high concentrations of some elements，such as iron，sulfur，aluminium，copper and high acidity The results show that the concentrations of iron，aluminium and sulfur are significantly correlated with the acidity of the acid water．     

Anaerobic biodegradability of terephthalic acid andits inhibitory effect on anaerobic digestion

ＡｎａｅｒｏｂｉｃｂｉｏｄｅｇｒａｄａｂｉｌｉｔｙｏｆｔｅｒｅｐｈｔｈａｌｉｃａｃｉｄａｎｄｉｔｓｉｎｈｉｂｉｔｏｒｙｅｆｆｅｃｔｏｎａｎａｅｒｏｂｉｃｄｉｇｅｓｔｉｏｎＫｕａｎｇＸｉｎ；ＷａｎｇＪｕｓｉ（ＲｅｓｅａｒｃｈＣｅｎｔｅｒｆｏｒＥｃｏ－Ｅ...     

Effect of organic acid on Cd toxicityin tomato and bean growth

ＥｆｆｅｃｔｏｆｏｒｇａｎｉｃａｃｉｄｏｎＣｄｔｏｘｉｃｉｔｙｉｎｔｏｍａｔｏａｎｄｂｅａｎｇｒｏｗｔｈＸｕｅＤｏｎｇｓｅｎ；ＲｏｂｅｒｔＢ．Ｈａｒｒｉｓｏｎ；ＣｈａｒｌｅｓＬ．Ｈｅｎｒｙ（ＵｎｉｖｅｒｓｉｔｙｏｆＷａｓｈｉｎｇｔｏｎ，ＡＲＩＯＳｅａ...     

Study on the toxicity of acid rain to microbiota in soils

With simulated acid rain and acidification, the soils from both Nanning and Liuzhou municipalities, Guangxi Zhuang Nationality Autonomous Region have been studied to determine the counts of azotobacter, bacteria, actinomyces and the activity of urease in soils, and the changes in respiratory intensity of soil so as to identify the toxicity of acidic substances to microbiota and enzyme in such soils. The concept of the critical pH of toxicity has been developed and used to discuss the representation of the concept, the basis on which the soil treated with simulated acid rain can be taken as an object of study, and the criteria for the identification of toxicity. Based on that as mentioned above, it was found that acid rain behaved to have toxicity to the microbiota in soils from Liuzhou other than from Nanning. The findings may be regarded as an objective basis to study the toxicity of acidic substances to microbiota and enzyme in soils in this region.     

Control strategy for sulfur dioxide and acid rain pollution in China

Ｃｈｉｎａ′ｓｅｃｏｎｏｍｙｈａｓｅｘｐａｎｄｅｄａｔａｎａｖｅｒａｇｅｏｆｏｖｅｒ 9%ｅａｃｈｙｅａｒｆｏｒｔｈｅｐａｓｔｔｗｏｄｅｃａｄｅｓ.Ｃｏｎｔｉｎｕｉｎｇｔｈｉｓｒａｐｉｄｅｃｏｎｏｍｉｃ ｇｒｏｗｔｈｗｈｉｌｅｓｉｍｕｌｔａｎｅｏｕｓｌｙｉｍｐｌｅｍｅｎｔｉｎｇｅｆｆｅｃｔｉｖｅ ｐｏｌｌｕｔｉｏｎｃｏｎｔｒｏｌｓｔｒａｔｅｇｙｐｒｅｓｅｎｔｓＣｈｉｎａｗｉｔｈａｎｕｒｇｅｎｔｃｈａｌｌｅｎｇｅ .1　Ｃｕｒｒｅｎｔｓｔａｔｕｓｏｆｓｕｌｆｕｒｄｉｏｘｉｄｅａｎｄａｃｉｄｒａｉｎｐｏｌｌ…     

Investigation of interactive effects of acid fogand ozone on spruce seedlings

ＩｎｖｅｓｔｉｇａｔｉｏｎｏｆｉｎｔｅｒａｃｔｉｖｅｅｆｆｅｃｔｓｏｆａｃｉｄｆｏｇａｎｄｏｚｏｎｅｏｎｓｐｒｕｃｅｓｅｅｄｌｉｎｇｓＺｏｕＳｉｗｅｉ；ＺｈｕＬｉａｎｘｉ（ＤｅｐａｒｔｍｅｎｔｏｆＥｎｖｉｒｏｎｍｅｎｔａｌＳｃｉｅｎｃｅａｎｄＥｎｇｉ...     

Humic acid and free radical in environment of Kaschin-Beck disease areas

The humic acid contents in drinking water and soil in Kaschin-Beck disease areas were found more than that of non-disease areas in this research. Changes of free radical concentration in drinking water were agreed with that of humic acid contents in drinking water of Kaschin-Beck disease areas. A positive correlation of free radical concentration and humic acid content in drinking water has been shown (r=0.913) . The structure of I. R. spectra of humic acid under ultraviolet light has been changed. Thus it indicated that free radical was resulted from benzoqiunonyl groups of humic acid in environment.