Selected trace elements in the Sacramento River, California: occurrence and distribution.

摘要: The impact of trace elements from the Iron Mountain Superfund site on Sacramento River and selected tributaries is examined. concentration distribution many elements—including aluminum, arsenic, boron, barium, beryllium, bismuth, cadmium, cerium, cobalt, chromium, cesium, copper, dysprosium, erbium, europium, iron, gadolinium, holmium, potassium, lanthanum, lithium, lutetium, manganese, molybdenum, neodymium, nickel, lead, praseodymium, rubidium, rhenium, antimony, selenium, samarium, strontium, terbium, thallium, thulium, uranium, vanadium, tungsten, yttrium, ytterbium, zinc, zirconium—were measured using a combination inductively coupled plasma-mass spectrometry plasma-atomic emission spectrometry. Samples were collected ultraclean techniques at sites in below Shasta Dam to Freeport, California, six separate time periods mid-1996 mid-1997. Trace-element concentrations dissolved (ultrafiltered [0.005-μm pore size]) colloidal material, isolated each large volume samples, are reported. For example, Zn ranged 900 μg/L Spring Creek (Iron acid mine drainage into Keswick Reservoir) 0.65 Freeport River. associated with material 4.3 (colloid-equivalent concentration) 21.8 Colusa Virtually all exist form. On entering Reservoir, metals least partially converted by precipitation or adsorption particulate phase. Despite this observation, few removed settling; instead majority transported, colloids, downriver, Bend Bridge site, which 67 km Dam. Most strongly colloid phase going downriver under both low- high-flow conditions.