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자료유형
학술저널
저자정보
저널정보
한국환경보건학회 한국환경보건학회지 한국환경보건학회지 제44권 제1호
발행연도
2018.1
수록면
55 - 62 (8page)

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Objectives: This study set out to measure the heavy metal concentrations in waste water produced in the casting pickling process at dental technical laboratories and examine the actual state of its treatment. Methods:The investigator measured the concentrations of each heavy metal at 55 dental technical laboratories usinganinductively coupled plasma optical emission system. Results: The annual usage of electrolytes was under 10 L in 50 (90.9%), and was 10L or more in five (9.1%) laboratories. Amongthe laboratories, 15 (27.3%) commissioned the treatment of waste,12 (21.8%) treated the waste with general sewage,and 28 (50.9%) treated the waste in aseptic tank. The arithmetic mean ± standard deviation and the geometric mean of chrome(Cr) were 75.3±50.9 and 58.3 mg/L; those of cobalt (Co) were 112.3±106.7 and 66.1 mg/L; those of nickel (Ni) were 62.9±83.5 and 8.9 mg/L; those of molybdenum (Mo) were 17.1±13.4 and 12.0 mg/L; those of iron (Fe) were 31.5±44.1 and 6.2 mg/L; those of lead (Pb) were 0.3±0.3 and 0.3 mg/L; those of beryllium (Be) were 3.6±3.6 and 2.0 mg/L. The hydrogen ion concentration was under pH 2 across all the samples. Conclusions: The findings show that the dental technical laboratories were not doing well with the separation, storage, collection, and treatment of the electrolytes they discarded, and that most of the electrolytes were introduced through the general sewage or aseptic tank. The causes of this include alack of perception among the practitioners atdental technical laboratories and contracted companies avoiding collection foreconomic reasons. There is a need for education to improve the perceptions of waste water treatment among the practitioners atdental technical laboratories. Environment-related departments should be stricter with legal applications in the central and local governments. It is also requiredto provide proper management of commissioned treatment.

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