M.
Taufiq, 2016. Concentration Analysis of Some Heavy Metal on the Indicated
Contaminated Paddy Field in Sawang, South Aceh District. A Master Thesis at the
Graduate Program of Syiah Kuala University, under the Supervision of Muyassir
and Teti Arabia.
ABSTRACT
Heavy metal in the soil will cause bioaccumulation in plants, and if
consumed by humans they will eventually lead to bioaccumulation in humans. Such
metal contamination makes the food unsafe for the human to consume. This study
aims to determine the concentration of heavy metals, Hg, Cd and Pb in the paddy
fields of Sawang in South Aceh District. There is an indication that the fields
have lately been polluted by careless use of agrochemicals during gold mining
and farming activities. This study used
grid method of soil survey known as rigid grid soil survey. The soil sampling
scheme was systematically designed, taking into account the expected range of
auto-correlation space. Observations distance was made regularly at a certain
distance to produce rectangular grids across the survey area while the soil
sampling was made in a regular pattern. The results indicated that the highest
mercury (Hg) concentration was at 3.582 mg.kg-1 while the lowest was at 0,001 mg.kg-1 with an average of 0.329 mg.kg-1. 5 out of 41 soil units analyzed had the
concentrations of Hg exceeded the TLV (Threshold Limit Value) allowed in paddy fields.
This means that paddy field in the 5 units (13, 15, 16, 17 and 18) have been
polluted with mercury. The range of Pb concentration in the soils was between
0.014 and 8.77 mg.kg-1 with an
average of 3. mg.kg-1. This
means that Pb concentration in all soil samples was far below TLV specified for
paddy fields at 250 mg.kg-1. The results of laboratory tests did disclose
any Cd concentration (undetectable) in the soil.
Keywords: Heavy metal, paddy field, gold mining.
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