• Journal of Food Hygiene and Safety
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• v.16 no.3
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• pp.178-187
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• 2001

A study has been performed to estimate the average and high (90th percentile of consumers-only) daily intakes of sorbates by age-sex groups (> 3 years old) in Korea. The estimation of daily intakes was based on individual-based dietary intake data in ‘National Health and Nutrition Survey in 1998’and the contents of sorbates from samples. The estimated daily intakes (EDI) of sorbates for average consumers ranged from 0.09 mg/kg/bw/day to 0.51 mg/kg bw/day corresponding to 0.4-2.1% of acceptable daily intake (ADI). For high consumers, the range of EDI of sorbates was 3.42-14.65 mg/kg bw/day corresponding to 13.7-58.6% of ADI. Foods that contributed most to the daily intakes of sorbates for all age-sex groups were processed fish products, processed meat products, and salted floods. There was an inverse relationship between age and the consumption of sorbates for average and high consumers, whereas no marked pattern was emerged by sex categories. The intake levels of sorbates even among high consumers were below the ADI in Korea.

• Journal of Food Hygiene and Safety
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• v.16 no.1
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• pp.53-60
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• 2001

A study has been carried out to estimate the average daily intakes of sorbates, benzoates, and and esters of $\rho$-hydroxybenzoic acid commonly used in Korea. The estimation of daily intakes was based on individual dietary intakes in “National Health and Nutrition Survey in 1998”and the the contents of preservatives from 264 samples. Estimated daily intakes(EDI) of sorbates, benzoates, esters of $\rho$-hydroxybenzoic acid were 0.22, 0.015, and 0.004 mg/kg bw/day, respectively. When assuming the standard body weight of 55 kg for Korean, ratios to acceptable daily intake (ADI) of sorbates, benzoates, and esters of $\rho$-hydroxybenzoic acid were 0.88, 0.30, and 0.04%, respectively.

• Journal of Food Hygiene and Safety
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• v.17 no.3
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• pp.166-172
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• 2002

This study has been carried out to estimate the average daily intakes of preservatives commonly used in Korea. The survey method, which is specific approach that can be applicable for Koreans has been proposed to estimate the daily intakes. The ADIS of sorbates, benzoates, and esters of p-hydroxybenzoic acid were less than 1% and judged to be safe. The EDIs of sorbates, benzoates, and esters of p-hydroxybenzoic acid were 0.39, 0.29, and 0.04 mg/kg bw/day respectively. And these data were compared with existing data. In case with sorbates, the EDI of survey data was higher than that of analytical data but much lower than that of maximum permitted level data. Also, the EDIs of benzoates and esters of p-hydroxybenzoic acid showed to be the same results. In conclusion, the EDIs of survey data lie between maximum Permitted level data and analytical data of Preservatives. The survey method could be considered as the possible alternative of refined method.

• Journal of Soil and Groundwater Environment
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• v.7 no.3
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• pp.85-94
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• 2002

Overall objective of this study was to evaluate the electrochemical characteristics of fine soils during the electrokinetic(EK) remediation. Zeta potential of kaolinite as a function of solution pH and surfactant concentration was investigated to make a relationship with electroosmotic flow direction and rate. During the EK experiments, pH of pore solution, electroosmotic permeability($k_e$), electric conductivity($\delta_e$) and voltage distribution was measured, respectively, The point of zero charge(PZC) of kaolinite was estimated to be about 4.2 and the zeta potential of kaolinite above PZC was more negative as solution pH increased. Sorption of surfactants on the kaolinite altered the zeta potential of kaolinite. resulting from the variation of electrochemical characteristics of kaolinite surface. hs the EK experiment progressed, low pH was predominant over most of the kaolinite specimen and thus resulted in very low mass and charge flow. The $k_e$ and $\delta_e$ was also affected by the variation of voltage drop across the EK column with time. Results from this study implied that zeta potential of kaolinite affected by the pH variation of pore solution and voltage distribution in soil column played important role in the determination of mass and charge flow during EK process. It was also suggested that pH adjustment or addition of suitable sorbates could alter the electrochemical characteristics of soil surface and thus maintain high mass and charge flow rate with time.