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71.
Fok TF Lam HS Ng PC Yip AS Sin NC Chan IH Gu GJ So HK Wong EM Lam CW 《Environment international》2007,33(1):84-92
This study was designed to examine newborn infants in Hong Kong prenatally exposed to levels of methylmercury considered to increase risk of neurotoxic effects and to examine subject characteristics that modify the degree of prenatal mercury exposure. Mercury concentrations in 1057 sets of maternal and cord blood samples and 96 randomly selected maternal hair samples were measured. Subject characteristics were measured or collected by questionnaire. Of the 1057 cord blood samples collected only 21.6% had mercury concentrations less than 29 nmol/L (5.8 micro g/L). Median maternal hair mercury concentration was 1.7 ppm. The geometric mean cord to maternal blood mercury ratio was 1.79 to 1. Increasing maternal fish consumption and maternal age were found to be associated with increased cord blood mercury concentrations. Marine fish consumption increased cord blood mercury concentrations more than freshwater fish (5.09%/kg vs 2.86%/kg). Female babies, maternal alcohol consumption and increasing maternal height were associated with decreased cord blood mercury concentrations. Pregnant women in Hong Kong consume large amounts of fish and as a result, most of their offspring have been prenatally exposed to moderately high levels of mercury. In this population, pregnant women should choose freshwater over marine fish and limit fish consumption. 相似文献
72.
Summer time haze characteristics of the urban atmosphere of Gwangju and the rural atmosphere of Anmyon, Korea 总被引:4,自引:0,他引:4
An extensive visibility monitoring was carried out simultaneously in the urban area of Gwangju and the rural area of Anmyon,
Korea. This study examines patterns of visibility impairment and haze-forming pollutant concentrations on both sites resulting
from natural and anthropogenic sources of gases and particles. Optical visibility measurements by a transmissometer, a nephelometer
and an aethalometer provide aerosol light extinction, scattering, and absorption coefficients for both sites. In order to
investigate the physico-chemical characteristics of atmospheric aerosols, aerosol samples were collected by various aerosol
samplers at GJVMS (Gwangju Visibility Monitoring Station) and at KGAWO (Korea Global Atmosphere Watch Observatory), respectively.
In addition, haze characteristics causing visibility impairment at those two sites were analyzed to obtain source contributions
by regionally transported aerosols using grid analysis and display system (GrADS) from NECP reanalysis data. During the intensive
monitoring period, ammonium sulfate was dominantly responsible for the fine particle mass loading at GJVMS, whereas organic
carbon was the largest contributor at KGAWO. Light scattering by particles accounted for 52.8 to 81.3% of the range at the
urban site, GJVMS and for 72.1 to 94.2% of the range at the rural site, KGAWO. Light absorption by the EC and NO2 was between 14.5 and 34.8% at GJVMS, which was higher than the observed 1.1 ∼ 6.8% at KGAWO, respectively. Light scattering
by aerosol was higher in the rural area than in the urban area. And organic carbon concentration was observed to be significantly
higher than the concentration of elemental carbon at KGAWO. These haze-forming carbonaceous particles originate from anthropogenic
pollutants at the urban atmosphere but they can be produced by natural environments such as marine and forest at the rural
atmosphere. 相似文献
73.
Hong Myung Hwan Joo So Young Kim Dong Wook Yoon Jin-Ho 《Journal of Material Cycles and Waste Management》2022,24(1):63-72
Journal of Material Cycles and Waste Management - Owing to the increasing ACW generation, asbestos detoxification and recycling technologies are required for environmental and economic reasons.... 相似文献