Chemical speciation of heavy metals in the Tigris River sediment

Abstract

After determination of total heavy metal concentrations in Tigris river sediments, a Tessier sequential extraction technique and a modified form using a microwave heating procedure were applied. Recoveries of total heavy metals from the sediment samples using the microwave and conventional techniques were reasonably comparable, in spite of a big difference in time required. 44-46% of Co, 24-36% of Cu, 69-81 % of Ni, and 55-73% of Zn were found in the residual fraction (i.e. not bioavailable).

Heavy metal concentrations in two barb, Barbus xanthopterus and Barbus rajanorum mystaceus from Atatürk Dam Lake, Turkey

“…Sediments samples were weighed, placed into the digestion bombs with 10 ml of HNO 3 /HCL (1:3 v/v) and digested in a microwave digestion system. Sediments analysis was carried out according to the procedure described earlier (Gümgüm and Öztürk 2001;Binning and Baird 2001). Fish samples, approximately 4-5 g of the epaxial muscle on the dorsal surface of the fish the entire liver, kidney and two gill rackers from samples (Barbus xanthopterus and Barbus rajanorum mystaceus) were dissected.…”

Heavy Metal Concentrations in Water, Sediment, Fish and Some Benthic Organisms from Tigris River, Turkey

“…The sediments were dried in petri dishes at 110°C for 24 h. The dried sediments were passed through a 60-mesh stainless screen to remove larger particles, and 0.5 g sediment was weighed into a 100-ml beaker. The sediment samples were prepared by the procedure described earlier by using concentrated HNO 3 / HCI (1:3 v/v) (Binning & Baird, 2001;Gümgüm & Öztürk, 2001). The beaker was cooled, and 10 ml HNO 3 was added.…”

Preparation and Solvent Extraction of Nickel Complex of O, O'‐Dinonyldithiophosphate and its Application to Spectrophotometric Determination of Nickel in Sediment Samples

“…Sediment samples were taken and prepared according to our previous procedures. 16 A stock solution of dinonyldithiophosphoric acid (2.0 g, 5.2 mmol) was prepared in 100 mL of carbon tetrachloride. Best conditions of the extraction studies were applied for different solvents such as kerosene, benzene, n-hexane, ethyl acetate, petroleum ether.…”

“…The study area and sampling is described in our earlier publications. 16 Sediment samples were digested by conventional and microwave wet acid (HNO 3 -HF) procedure. 16 Copper was eliminated by extraction with 0.1% of DNDTPA at pH 0.1.…”

“…16 Sediment samples were digested by conventional and microwave wet acid (HNO 3 -HF) procedure. 16 Copper was eliminated by extraction with 0.1% of DNDTPA at pH 0.1. Nickel was separated from cobalt by multiple (four fold) extraction process in optimum study conditions.…”