In November 1997, the pollution degree has increased 85.5 times for Cd, 6 times for Hg, 7.54 times for Pb, 3.82 times for As, 7.82 times for Zn and 3.46 times for Cu compared respectively with the lowest content of these elements during last hundred years.
This paper briefly expounds the kinds, sources and harms of hydraulic oil pollutants in hydraulic equipment, and introduces the monitoring installations for measuring the oil pollution degree of hydraulic system by using MCS51 one-chip computer based on automatic grain counting principle.
Using environmental conditions(atmosphere pressure,ice weight and pollution degree)as inputs,insulator flashover voltage as outputs,the relation between environmental conditions and flashover voltage is trained and the flashover voltage forecasting model is built.
along with the increase of pollution degree, the increase percentage of pollution flashover voltage of V-shape arrangement and the decrease percentage of pollution flashover voltage of II-shape arrangement in comparison with I-shape arrangement are enlarged.
The result indicates that the grounding current and surface leakage current of pollution composite insulator are the same in the change of amplitude and waveform, thus the pollution degree of composite insulator can be detected by measuring the current flow in the earth wire of insulator.
The pollution degree of heavy metals including mercury,arsenic,lead,cadmium and chromium was analyzed and appraisal according to GB18406.1-2001 in 127 samples from 8 main vegetables production area in Shaanxi Province.
Based on the pol1ution investigation of automobile's tall gas in Lanzhou City, the air pollution of street is heavier, with CO, NOx, SO2, TSP and Pb exceeding the standard. The pollution degree is related to traffic flow,time, season, road width, wind speed and various traffic crossings.
According to the investigation of "Study on laboratory pollution investigation and administration scheme" project team,which is organized by Department of Chemistry of Zunyi Normal College,for this laboratory chemical laboratory pollution situation,the pollution degree of chemical laboratory is investigated,the major reason of causing pollution is also analyzed and corresponding preliminary countermeasures are put foreword.