1樓：robin15
1克=1000毫克 1毫克=1000微克 1微克=1000納克1納克=1000皮克
廣州市食用魚體內PCBs和DDTs的殘留水平及食用風險評估--《熱帶海洋學報》2023年05期
PCBs和DDTs在廣州食用魚體中普遍檢出,其濃度範圍分別為71~1488和695~38044pg·g-1(濕重)。魚體中PCBs和DDTs濃度均與脂肪含量存在極顯著的正相關關係,
Polychlorinated Biphenyls and other Synthetic Organic Contaminants Associated with Sediments and Fish in the Mississippi River
AChlordane is especially concentrated in catfish. Concentrations of chlordane shown here are substantially greater than those on the suspended sediment in the Mississippi River, which are almost always less than 10 (often less than 5) nanograms of chlordane per gram of suspended silt. Chlordane is especially lipophilic-that is, especially soluble in the fatty tissues of the fish-and difficult to metabolize.
The action level for chlordane of 300 nanograms per gram, specified by the U.S. Food and Drug Administration (USFDA, 1986) corresponds to the top of the graph.
BPCB concentrations in catfish in the Mississippi River are comparable to those on suspended sediment. Although the "total" PCB shown here refers to the sum of the tetra-, penta-, hexa-, and heptachlorobiphenyls, this total is comparable to that of the penta-, hexa-, hepta-, and octachlorobiphenyls portrayed in the other figures of this chapter. The action level for PCBs of 2,000 nanograms per gram, specified by USFDA (1986), is well above the range of values shown here.
的確，密西西比河裡的魚PCBs的含量是廣州市的 1000倍左右。