tailieunhanh - NATURAL ARSENIC IN GROUNDWATER: OCCURRENCE, REMEDIATION AND MANAGEMENT - CHAPTER 14

Một tảo xanh (Pithophora) thu thập được từ khu vườn thực vật của Đại học Dhaka đã được trồng trong ống nghiệm có chứa hoặc chưa pha thêm thạch tín (As). Asen tỷ lệ ứng dụng là 0,0, 0,05, 0,25, 0,5, và 1,0 mg / L. Các loại tảo phát triển trong 90 d, trong đó tảo nhận được trong gia số phương pháp điều trị của Như ở nồng độ quy định. Sau 90 d tảo được thu thập thông qua lọc. Tảo thu thập được sấy khô, nghiền thành bột, và hóa học phân tích cho Như. . | Natural Arsenic in Groundwater Occurrence Remediation and Management -Bundschuh Bhattacharya and Chandrasekharam eds 2005 Taylor Francis Group London ISBN 04 1536 700 X Arsenic bioaccumulation in a green algae and its subsequent recycling in soils of Bangladesh Imamul Huq Afroza Bulbul . Choudhury Department of Soil Water Environment University of Dhaka Dhaka Bangladesh Shah Alam Shigenao Kawai Department of Agro-Bioscience Iwate University Morioka Japan ABSTRACT A green algae Pithophora collected from the botanical garden of Dhaka University were grown in vitro containing or not added arsenic As . Arsenic application rates were and L. The algae were grown for 90 d during which the algae received in increments the treatments of As at the specified concentration. After 90 d the algae were collected through filtration. The collected algae were dried pulverized and chemically analyzed for As. The treated algae were then added to a soil and were allowed to decompose over a period of 45 d. Soil samples were collected at intervals of 15 30 and 45 d. The decomposition of algae to soil enrichment with As was studied. Presence of As in the algal growth medium substantially increased the cellular As content of algae and was contributory to soil enrichment by the element upon mineralization. 1 INTRODUCTION Arsenic As in groundwater and its fate and transport in the environment have become matters of great concern in Bangladesh. Tube-well water extracted in Bangladesh from shallow aquifers is the primary source of drinking cooking water for most of its population. Besides domestic use huge quantities of water from shallow aquifer are also used for irrigation during the dry season. Since its detection in late 1993 in Bangladesh much of the research works on As have focused on its presence in and exposure through drinking cooking water Yousuf et al. 2001 . However widespread use of groundwater for irrigation suggests that ingestion of irrigated crops .

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