tailieunhanh - Mercury Hazards to Living Organisms - Chapter 7

Thủy ngân dữ liệu cho các mẫu phi sinh học cũng như các sinh vật sống đại diện của các hệ sinh thái khác nhau được lấy từ một miền địa phương bộ sưu tập duy nhất, thường là ở cùng một thời điểm bởi cùng một nhóm nghiên cứu, đặc biệt có giá trị. Những dữ liệu này có thể minh họa biomagnification web thực phẩm và các hiện tượng khác dễ dàng hơn so với các bit dữ liệu bị cô lập rút ra qua nhiều năm từ miền địa phương khác nhau bằng cách sử dụng các. | Chapter 7 Mercury Concentrations in Abiotic Materials and Multitaxonomic Field Collections Mercury data for abiotic samples as well as living organisms representative of different ecosystems taken from a single collection locale usually at the same time by the same research group are particularly valuable. Such data may illustrate food web biomagnification and other phenomena more readily than isolated data bits drawn over several years from disparate locales using different collection methods various sample preparations and noncomparable chemical methodologies for mercury analysis. One integrated data set demonstrated that mercury from point-source discharges such as sewer outfalls and chloralkali plants was taken up by sediments and the sediment mercury levels were then reflected by an increased mercury content of epibenthic fauna Klein and Goldberg 1970 Takeuchi 1972 Dehlinger et al. 1973 Hoggins and Brooks 1973 Klemmer et al. 1973 Parsons et al. 1973 . In another case analysis of the effluent from the Hyperion sewer outfall in Los Angeles showed a mercury concentration slightly below mg L Klein and Goldberg 1970 . Concentrations of mercury in sediment samples near this outfall were as high as mg kg but decreased with increasing distance from the outfall mercury levels in epibenthic fauna including crabs whelks and scallops were also highest at stations near the discharge and lowest at stations tens of kilometers distant. Selected data sets for mercury are presented in Table at locations in the Adriatic Sea Alaska Antarctica Brazil Canada China Cuba Florida Greenland India Italy Korea Malaysia New Jersey Puerto Rico Spain Taiwan Tennessee Thailand and Vietnam. ASIA In the People s Republic of China the Sonhua River received about metric tons of mercury annually for about 15 years in the 1960s and 1970s resulting in water concentrations of pg methylmercury L vs. to pg L from a reference site Soong 1994 . Catfish a major .