Grabowski L A, Houpis J L, Woods W I, Johnson K A
Department of Rangeland Ecosystem Science, Colorado State University, Berthoud 80513, USA.
Chemosphere. 2001 Nov;45(4-5):643-51. doi: 10.1016/s0045-6535(01)00037-6.
A value of simultaneously extracted metal to acid-volatile sulfide (SEM-AVS) can provide important information regarding metal availability in anaerobic sediment. SEM and AVS concentrations were obtained by the cold-acid purge-and-trap technique during spring and summer at six locations along the Mississippi River floodplain. SEM-AVS values and AVS concentrations did not vary significantly between locations during both seasons. AVS concentrations were significantly greater during summer than spring, resulting in significantly lower SEM-AVS values in summer. Total SEM concentrations did not significantly vary between seasons or specific locations. SEM-AVS values were greater than one at each location during both seasons. Sediment metal toxicity was predicted to be absent for benthic organisms along the river floodplain.
同时提取的金属与酸挥发性硫化物的比值（SEM-AVS）能够提供有关厌氧沉积物中金属有效性的重要信息。在春季和夏季，通过冷酸吹扫捕集技术，在密西西比河漫滩沿线的六个地点获取了SEM和AVS的浓度。在两个季节中，各地点之间的SEM-AVS值和AVS浓度均无显著差异。夏季的AVS浓度显著高于春季，导致夏季的SEM-AVS值显著降低。总SEM浓度在不同季节或特定地点之间没有显著变化。在两个季节中，每个地点的SEM-AVS值均大于1。预计河流漫滩底栖生物不存在沉积物金属毒性。
