The traditional methods for measuring water quality variables are timeconsuming and do not give a synoptic view of a water body or, more significantly, a synoptic view of different water bodies across the landscape. However, remote sensing technology with advantages such as wide area coverage and short revisit interval have been effectively used for environmental pollution applications, such as for monitoring water quality parameters. Many studies around the world show that optical satellite imagery can be used effectively in evaluating suspended sediment concentration. This article presents results of monitoring suspended sediment concentration in Red River, Hanoi, Vietnam through ground truth measurements and VNREDSat-1A multispectral data. The results obtained in the study can be used to serve the management, monitoring and evaluation of surface water quality.kEY wORDS: remote sensing, multispectral image, suspended sediment, surface water quality, VNREDSat-1A CITATION:
Air pollution in Vietnam, especially the pollution caused by metal elements are more severe due to the rapid growth of industrialization. The study of air pollution caused by metals elements is a hard and expensive work. Develoment of the simple and cheap methods for studying metal pollution in the air is being carried out in many countries of the world. In this paper, we used Barbula Indica moss for studying heavy metal pollution in the air in Hanoi, Hung Yen and Dong Nai provinces and the obatined results will be presented.
Abstract:This paper assesses the risk of lead and cadmium heavy metals on Cyprinus carpio in laboratory conditions. The research determined the 96 hours LC50 value of lead nitrate and cadmium nitrate in the fish Cyprinus carpio. This study combined the ecological toxicology test with the ecological hazard description to determine the acute toxicity effects of lead and cadmium on Cyprinus carpio. Ecological toxicology took place in 96 hours with test concentration of 0.25; 0.5; 1.0; 1.5; 2.0 mg/l on lead and 0.5; 1.0; 1.5; 2.0; 3.0 mg/l on cadmium. Through probit analysis, the LC50 after 96 hours of lead and cadmium in Cyprinus carpio was found to be 0.987 mg/l and 1.171 mg/l, respectively. Through monitoring the biological behaviour of Cyprinus carpio when exposed to lead and cadmium, it was observed that the number of deaths is proportional to the concentration of chemical exposure time. The abnormal morphology and behaviour of the fish also increased with testing time and lead and cadmium concentration. Cyprinus carpio also absorbs lead and cadmium in its body; the cumulative content is similar as above.
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