POTENTIAL USE OF NATURALLY-OCCURRING SULFURIC-ACID TO BENEFICIATE POORLY SOLUBLE PHOSPHATE FROM EPPAWALA, SRI-LANKA

被引：7
|
作者：
DAHANAYAKE, K
SENARATNE, A
SUBASINGHE, SMND
LIYANAARACHCHI, A
机构：
[1] Department of Geology, University of Peradeniya, Peradeniya
[2] Earth Sciences Division, Institute of Fundamental Studies, Kandy
[3] Kandy District Water Supply and Sanitation Project (FINNIDA), Kandy
来源：
FERTILIZER RESEARCH | 1991年 / 29卷 / 02期
关键词：
PHOSPHATE; PEAT; SULFURIC ACID;
D O I：
10.1007/BF01048960
中图分类号：
S15 [土壤学];
学科分类号：
0903 ; 090301 ;
摘要：
A 29 000 yr old high-sulphur peat deposit occurs in the western district of Colombo, Sri Lanka. This permanently submerged deposit has several pyrite-rich layers in 8 to 10 m sequences and is connected to the open ocean. Sea water intrudes to the peat deposit during tidal movements. Villagers have excavated the peat to form islands which serve as foundations for their dwellings. The areas around these peat-rich man-made islands are inundated daily due to tidal movements. The interstitial waters of these tidal zones indicate low pH (2 to 5) and high Eh and are rich in sulphuric acid. Selected samples from the poorly soluble phosphate deposit at Eppawala were left buried in the sulphate-rich zones for fixed periods of time. Some phosphate samples when retrieved from the peat deposit showed four-fold increases of solubility. Preliminary agronomic experiments to grow paddy in P-deficient soils with the beneficiated phosphate fertilizer have given favourable results.
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页码：197 / 201
页数：5
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