(中南大學(xué) 冶金科學(xué)與工程學(xué)院，長沙410083)
摘 要: 采用Tessier連續(xù)提取ICP-AES法對湖南某廠鉻渣堆場土壤中重金屬鉻的存在形態(tài)(水溶性鉻、交換態(tài)鉻、碳酸鹽結(jié)合態(tài)鉻、有機(jī)結(jié)合態(tài)鉻、鐵錳結(jié)合態(tài)鉻和殘?jiān)鼞B(tài)鉻)進(jìn)行分析。研究結(jié)果表明，鉻渣堆場土壤鉻污染嚴(yán)重；鉻渣堆場下土壤中大部分鉻以鐵錳結(jié)合態(tài)形式存在，在鉻渣堆場周圍和離鉻渣堆場5 km處未污染土壤中鉻大部分以殘?jiān)鼞B(tài)的形式存在；交換態(tài)鉻和碳酸鹽結(jié)合態(tài)鉻在土壤各剖面層次的含量相差不是很大，而可溶性鉻和殘?jiān)鼞B(tài)鉻在0~40 cm土層富集，有機(jī)結(jié)合態(tài)鉻和鐵錳結(jié)合態(tài)鉻在40~60 cm土層富集。
關(guān)鍵字: 鉻渣堆場；鉻污染；Tessier連續(xù)提取法
chromium-containing slag
（School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China）
Abstract:The selective sequential extraction procedure developed by Tessier was used to investigate the contents of various chromium fractions including water soluble chromium, exchangeable chromium, carbonate bonded chromium, organics bonded chromium, Fe-Mn bonded chromium and residual chromium, and their distribution in soils contaminated by chromium-containing slag in a chromate manufactory in Hunan Province. The contents of chromium in the suspensions were determined with ICP-AES. Results show that chromium-containing slag results in a serious soil contamination. And in the contaminated soils underneath the chromium slag Fe-Mn-bound chromium is the predominant fraction, while in the soils in the vicinity of slag and the uncontaminated soils, residual chromium is the main fraction. There is no obvious difference of exchangeable chromium and carbonate-bound chromium in soil profiles, but relatively high amounts of soluble chromium and residual chromium are found in 0−40 cm of soil depth and relatively high amounts of organics bonded chromium and Fe-Mn bonded chromium in 40−60 cm of profile layer.
Key words: chromium slag; chromium contamination; Tessier sequential extraction
