우리나라 논 토양 중 수은함량과 벼 흡수이행 = Mercury Contents of Paddy Soil in Korea and its Uptake to Rice Plant

다국어 초록 (Multilingual Abstract)

Objective of this study was to investigate the residual levels of mercury (Hg) in soil for “Top-rice”
area and its uptake into rice plant for making sure food safety as compared to “Top-rice” & common rice produced
from 2005 to 2006. Hg was analyzed with the direct mercury analyzer (DMA 80, Milestone, Italy), which implements
the US/EPA method 7473. The average concentration of Hg in paddy soil was 0.031 mg/kg, which was below at 1/25-
1/65 fold of the threshold levels (concern level 4 mg/kg, action level 10 mg/kg) for soil contamination designated by
“The Soil Environment Conservation Law” in Korea. The maximum residue level (MRLs) for Hg residue in the polished
rice is not designated in Korea. Therefore, Hg contents in the polished rice of “Top-rice” brand and common rice
were compared to other country's criteria. Hg contents in the polished rice of “Top-rice” brand was 0.0018 mg/kg,
which was lower at 1/10-1/30 fold than the MRLs, 0.02 mg/kg of China criteria and 0.05 mg/kg of Taiwan criteria,
respectively. Hg were 0.02788, 0.00896, 0.00182, 0.00189, 0.00166, 0.00452 and 0.00145 mg/kg in soil, rice straw,
unhulled rice, rice hulls, brown rice, rice bran, and polished rice produced in 2006 “Top-rice” area, respectively. For
the ratio of Hg as compared to Hg contents in soil, there were 0.321 of rice straw >> 0.162 of rice bran >> 0.068 of
rice hulls > 0.065 of unhulled rice > 0.060 of brown rice> 0.052 of polished rice. And, the slope of Hg uptakes was
steeped as following order; rice straw >> rice bran >> rice hulls > unhulled rice > brown rice > polished rice. It means
that the more slope steeped was the more uptakes. For the distribution of Hg uptaken, there was 83.8% into rice straw,
and 16.2% into unhulled rice, 2.8% into rice hulls, 12.4% into brown rice, 3.5% into rice bran and 9.7% into polished
rice. Consequently, it was appeared that the Hg contamination in the polished rice should not be worried in Korea.

다국어 초록 (Multilingual Abstract)

Objective of this study was to investigate the residual levels of mercury (Hg) in soil for “Top-rice”
area and its uptake into rice plant for making sure food safety as compared to “Top-rice” & common rice produced
from 2005 to 2006. Hg was analyzed with the direct mercury analyzer (DMA 80, Milestone, Italy), which implements
the US/EPA method 7473. The average concentration of Hg in paddy soil was 0.031 mg/kg, which was below at 1/25-
1/65 fold of the threshold levels (concern level 4 mg/kg, action level 10 mg/kg) for soil contamination designated by
“The Soil Environment Conservation Law” in Korea. The maximum residue level (MRLs) for Hg residue in the polished
rice is not designated in Korea. Therefore, Hg contents in the polished rice of “Top-rice” brand and common rice
were compared to other country's criteria. Hg contents in the polished rice of “Top-rice” brand was 0.0018 mg/kg,
which was lower at 1/10-1/30 fold than the MRLs, 0.02 mg/kg of China criteria and 0.05 mg/kg of Taiwan criteria,
respectively. Hg were 0.02788, 0.00896, 0.00182, 0.00189, 0.00166, 0.00452 and 0.00145 mg/kg in soil, rice straw,
unhulled rice, rice hulls, brown rice, rice bran, and polished rice produced in 2006 “Top-rice” area, respectively. For
the ratio of Hg as compared to Hg contents in soil, there were 0.321 of rice straw >> 0.162 of rice bran >> 0.068 of
rice hulls > 0.065 of unhulled rice > 0.060 of brown rice> 0.052 of polished rice. And, the slope of Hg uptakes was
steeped as following order; rice straw >> rice bran >> rice hulls > unhulled rice > brown rice > polished rice. It means
that the more slope steeped was the more uptakes. For the distribution of Hg uptaken, there was 83.8% into rice straw,
and 16.2% into unhulled rice, 2.8% into rice hulls, 12.4% into brown rice, 3.5% into rice bran and 9.7% into polished
rice. Consequently, it was appeared that the Hg contamination in the polished rice should not be worried in Korea.

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