The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
In this paper, flue-cured tobacco cultivar (Nicotiana tabacum L. K 326) was selected to explored responses of flue-cured tobacco plants to different concentration of lead (Pb) or cadmium (Cd). The plants were grown in nutrient solution in lab under the controlled condition. Research showed dry weights of each organ and whole plant and values of botany characters and Chlorophyll contents of upper leaf...
The environmental impact of heavy metal pollution from mining activities is of growing concern. Here we have carried out an environmental geochemical investigation to determine the concentrations of heavy metals (Cd, Pb, Zn, and Cu) in soils in and around lead-zinc mining and zinc smelting areas in Northeastern China, analyze the characteristics of heavy metal contamination and assess pollution level...
By using a hydrothermal treatment process, coal fly ash was transferred to a series of synthesized zeolites and characterized XRD and SEM observations. The synthesized zeolites exhibited more enhanced adsorption capacities for metals compared to the raw material as the increased CEC of the synthesized zeolites apparently provides a better adsorptive ability for metals. For the three synthesized zeolite...
The effects of two earthworm species (Eisenia foetida and Allolobaphora caliginosa) on the bioavailability of Zn or Pb were studied in three soils (Cinnamon soil, Aquic brown soil and Acid brown soil) spiked with 200 mg kg-1 Zn or 400 mg kg-1 Pb, respectively. The results showed that Eisenia foetida and Allolobaphora caliginosa were tolerant to Zn or Pb. but the growth of earthworms was adversely...
Soils and dominant plants were surveyed in the Siding mineland area. Based on the determination of heavy metal concentration of soil from 8 sections and 14 dominant plant species in different parts, the potential ecological risk was assessed using the Hakanson Index Method. The results indicated that the soil of Siding mineland area was seriously contaminated by Pb and Zn. The risk index values of...
To reveal the spatial variability of soil heavy metals under the influence of urban expansion, Yingxing city of Jiangsu province was selected as study area. Three transects were arranged in the urban-rural ecotone. 24 surface soil samples were collected. And the contents of heavy metals including Hg, Pb, Cu and Zn were measured and analyzed. The results were as follows: (1) Hg contamination and Pb,...
This paper collected soil samples on provincial highway of Qiting of Yixing City at the leeward of the wind to study the space diversity condition of soil heavy metal pollution at the side of the road traffic under the influence of traffic. The results shows that: (1) Contents of Pb and Cu in the farmland soil on both sides of transport road existed accumulative phenomena and they were affected by...
On basis of chemical extraction technology, H3PO4 has been used to remove heavy metals from the industrial sewage sludge. At the laboratory scale, heavy metals Zn, Pb, Cd, Ni, Cr and Cu were extracted synchronously from the sewage sludge. The results showed that H3PO4 concentrations had a significant effect on the extraction efficiency of heavy metals. The extraction efficiency increased gradually...
Soil samples of 0-15cm from 9 sampling sites including different functional zones and different greening types of Shanghai, China were collected and analyzed. The results showed the average concentration of Cu, Pb, Zn and Cd in soil of shanghai were up to 42.33,169.58,49.06, and 0.2460mg/kg, respectively, which were much higher than their natural background values. Among the functional zones and the...
Farmland soil in the suburb is polluted to some degree due to the effect of human activities. In this paper spatial distribution and pattern of copper (Cu), lead (Pb) and zinc (Zn) contents in the farmland soil in suburb of Harbin were analyzed using geostatistics methods. Results of semivariance fitness models showed that contents of Cu and Zn were auto-correlated to a high degree respectively, while...
Biowaste, the source separately collected organic fraction of municipal solid waste, can be reused for soil conditioning after composting. In this way, environmentally harmful waste management strategies, such as landfilling or incineration, can be reduced. However, frequent application of composts to soil systems may lead to the accumulation of heavy metals in soils, and therefore legal criteria...
Taking the main pollution source of sewage river in north China as study object, concentrations of ammonia, chemical oxygen demand and heavy metals in sources of pollution and nearby water are determined. The two dimension steady river water quality models of ammonia and chemical oxygen demand are established, and the geometric characteristics of pollutant zone at downstream of the pollution source...
Based on leaching experiment, the leaching of heavy metal in mine waste was brought out. The research showed that Zn, Cr, Pb and Cu concentrations are most in the leachate of weathered coal waste, and the concentration became stable rapidly; only Zn concentrations are found in fresh mine waste leachate in the beginning time. The soil around mine waste also was contaminated by heavy metal, such as...
Pollution property of particulates in the air and its affecting factors at the traffic crossing in Harbin were studied. PM10 in atmosphere was sampled in August 2005 near the roads of Harbin, the ions, heavy metals and carbon ingredients of PM10 were analyzed. The results showed that the proportion of the samples which didn't meet the national standard was 75%. The concentrations of SO42-, NH4+,...
The aim of the present study was to investigate the pollution situation of a closed landfill located in Likeng village, Guangzhou. Soil samples in different depths were collected from the studied area. Among of them, total 108 samples (0~10 cm) of surface soil were analyzed for Cd, Cr, Hg, Ni, Pb and Zn investigation. The samples were digested with HNO3 and HF and HClO4. The concentrations of Cd,...
In order to study the relationship of heavy metals between coconut palm (Cocos nucifera L.) and the environment, concentrations of Cd, Co, Cr, Cu, Ni, Pb, Zn, Ti and V in bark and leaf samples of cocos in Haikou and Sanya cities were analyzed. The results showed that coco barks and leaves are subject to accumulate Cd, Cu, Pb and Zn. All the studied element contents in barks and leaves in Haikou are...
A total of 44 topsoil samples (depth=0~20 cm)and 8 deep-soil samples (depth=150 ~ 200 cm) were collected from urban green space and roadside green belt in Sanya in order to : (1) get the total content of eight heavy metals (Hg, As, Cr, Ni, Cu, Pb, Cd and Zn) in urban soils in Sanya; (2) to identify the degree of heavy metal contamination by comparing with other studied cities; and (3) to determine...
A selective sequential extraction method developed by Tessier et al was used to study the speciation of heavy metal elements, Cr, Cu, Zn, and Pb, in soils taken from six different functional areas in Urumqi. The results showed that the contents of Pb, Zn, Cr, and Cu were significantly above their average background values, as high as 3.6 times, 2.3 times, 2.1 times, and 1.9 times, respectively. In...
Heavy metals, a kind of persistent toxic substance (PTS), were taken for the study in this paper. Dust samples (44 in total) were collected in 2006 in Shanghai urban parks. The concentrations of Cu, Pb and Zn in dusts were determined by atomic absorption spectrometer. The concentrations of mean metals in dust samples were in the order Zn > Pb > Cu, where Pb shows the greatest coefficient of...
In recent years, it draws people's attention to the high frequency of fog and haze. Shijiazhuang is a city where fog and haze have high frequency. This article takes the inhalant particles of fog and haze in the urban district in Shijiazhuang as the main research target, according to the data of the analyzed chemical elements in particles of fog and haze, four main sources of inhalant particles are...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.