• Title/Summary/Keyword: Metal Level

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Comparison of Heavy Metal Level in Blood Between Industrial Workers and General People

  • Lee Mi-Hwa
    • Biomedical Science Letters
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    • v.10 no.4
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    • pp.453-457
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    • 2004
  • The welders and car painters are frequently exposed to heavy metals such as lead, zinc, cadmium and chromium, and those are a major source of heavy metal poisoning. This study was carried out to investigate the relationship of the heavy metal level in blood by age, working duration, and smoking status among 105 industrial workers and 88 general people in Gyeongnam province from October 2003 to October 2004. The heavy metal level in blood was analyzed by atomic absorption spectrophotometer. Mean blood lead level in exposed group and control group was 8.40±4.67μl/dl, 1.82±1.35μl/dl, respectively. Mean blood zinc level in exposed group and control group was 9.43±5.38 ㎍/ml, 2.89±1.79㎍/ml, respectively. Mean blood cadmium level in Exposed group and control group was 1.53±1.05μl/dl, 0.60±0.49 μl/dl, respectively. Mean blood chromium level in exposed group and control group was 0.89±0.76μl/dl, 0.68±0.63μl/dl, respectively. Lead, zinc, cadmium and chromium level in blood of exposed group was significantly higher than that of control group. In the comparison of smoking status, lead, zinc and cadmium level of smoker's was significantly higher than that of non-smoker's. Comparison of heavy metal level by age, lead, zinc, cadmium level in 40's, 50's (exposed group) in blood significantly higher than that of 20's, 30's. In exposed group, working duration has no significant difference. In conclusion, smoking was the most hazardous factor to elevate in blood heavy metal levels.

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Effect of Ohjeoksan-Decoction on Brain Metal Level in Rats (오적산을 투여한 흰쥐의 뇌중 금속농도변화에 관한 연구)

  • Min Dae Ki;Han Seong Nim;Ko Seong Gyu
    • Journal of Physiology & Pathology in Korean Medicine
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    • v.16 no.5
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    • pp.967-975
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    • 2002
  • This study was to investigate the metal accumulation from Ohjeoksan-Decoction to rat brain(Sprague Dawley). 1. In Control group, each metal concentration was within 26.65mg/kg, and in each experimental groups, was within 28.39mg/kg. And, there were no significant metal concentration between control and experimental groups. Exceptionally, Cr and Ni level of control group was lower than experimental groups significantly. (p<0.05) and Cr and Ni level of experimental I group was lower than other experimental groups too.(p<0.05). But, Pb level of control group was higher than experimental groups significantly.(p<0.05) Pb level of experimental I group was higher than other experimental groups(p<0.01). 2. In non-hazardous, hazardous and total metal concentration, there was no increase tendency in brain according to the high dose of OD(Ohjeoksan-Decoction) intake. Reversely, in experimental groups, hazardous metal concentration was decrease by high OD intake.(p<0.05). 3. Correlation among each metal in brain was various in each groups. Briefly under the intake of Ohjeoksan-Decoction, that is very busy herb prescription, this study was defined within safety in brain metal level by P.O. during 10 days. But, there should be a more research about Pb increase by high dose OD intake

Brain Metal Level in Ohjeoksan-Treated Rats (오적산(五積散)을 투여한 흰쥐의 뇌중 금속농도변화에 관한 연구)

  • Min Dae-Ki;Goh Seong-Kyu;Lee Sun-Dong;Wen Yong
    • Journal of Society of Preventive Korean Medicine
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    • v.4 no.2
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    • pp.242-257
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    • 2000
  • This study was to investigate the metal accumulation from Ohjeoksan-Decoction to rat brain(Sprague Dawley). 1. In Control group, each metal concentration was within 26.65mg/kg. and in each experimental groups, was within 28.39mg/kg. And there were no significant metal concentration between control and experimental groups. Exceptionally, Cr and Ni level of control group was lower than experimental groups significantly. (p<0.05) and Cr and Ni level of experimental I group was lower than other experimental groups too. (p<0.05). But, Pb level of control group was higher than experimental groups significantly (p<0.05) Pb level of experimental I group was higher than other experimental groups(p<0.01) 2. In non-hazardous, hazardous and total metal concentration, there was no increase tendency in brain according to the high dose of OD(Ohjeoksan-Decoction) intake. Reversely, in experimental groups, hazardous metal concentration was decrease by high OD intake. (P<0.05) 3. Correlation among each metal in brain was various in each groups Briefly under the intake of Ohjeoksan-Decoction, that if very busy herb prescription , this study was defined within safety in brain metal level by P.O. during 10 days. But, there should be a more research about Pb increase by high dose OD intake

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Evaluation of a metal level in non-precious metal alloys dental casting having beryllium by lactic acid Solution (베릴륨함유 치과 주조용 비귀금속 합금의 젖산용액에 의한 금속 노출수준 평가)

  • Park, Soo-Chul;Jang, Eun-Jin;Han, Sok-Yoon
    • Journal of Technologic Dentistry
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    • v.33 no.2
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    • pp.121-128
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    • 2011
  • Purpose: The purpose of this study is to investigate the level of each metal in non-precious metal alloys dental casting, still used even banned for use and trade by the law, for oral health. Methods: Two kinds of metal alloys were analyzed. One was Ticonium 100 for removable prosthesis and the other was Rexillium V for dental porcelain. Two samples of each metal alloy were made in 0.5g, 1.0g, and 1.5g. Total number of samples were 12. Two kinds of lactic acid Solution, pH7 and pH4.6, were injected into each samples. After injection, each samples had been for 21days ${\pm}$ 1 hour in the water tank of which temperature was $37^{\circ}C$. The level of metal was measured in each sample by inductively couplled plasma-atomic emission spectrometer. Results: In both metal alloys, metals, chrome, nickel, beryllium, and molybdenum, were founded. In Ticonium 1000, the highest level of nickel was 2.531ppm in 1.5g pH4.6 sample while the highest level of nickel was 4.062ppm in 1.5g pH4.6 sample of Rexillium V. In chemical composition of these methal alloys, chrome(14~17%) was much more than beryllium(1.95~1.99%) and molybdenum(5.0~9.0%) but berllium and molybdenum were founded more than chrome in samples. Therefore, chrome showed better anti-corrosion than other metal alloys. In both metal alloys, more metals were founded in higher pH level and more mass. Levels of chrome was significantly different in samples of both metal alloys in each pH level(p<0.05). Levels of nickels was significantly different in samples of both metal alloys in each pH level(p<0.05). Conclusion: For oral health, further studies are needed in nickel-chrome metal alloy and cobalt metal alloy of non-beryllium in addittion to beryllium metal alloy and also long-term studies needed in various period and other non-percious metal alloys for dental casting.

Association between Soil Contamination and Blood Lead Exposure Level in Areas around Abandoned Metal Mines (폐금속광산지역 토양오염정도와 혈 중 납 노출 수준의 상관성)

  • Seo, Jeong-Wook;Park, Jung-Duck;Eom, Sang-Yong;Kwon, Hee-Won;Ock, Minsu;Lee, Jiho
    • Journal of Environmental Health Sciences
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    • v.48 no.4
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    • pp.227-235
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    • 2022
  • Background: Abandoned metal mines are classified as vulnerable areas with the highest level of soil contamination among risk regions. People living near abandoned metal mines are at increased risk of exposure to toxic metals. Objectives: This study aimed to evaluate the correlation between soil contamination levels in areas around abandoned metal mine and the blood lead levels of local residents. Moreover, we assess the possibility of using soil contamination levels as a predictive indicator for human exposure level. Methods: Data from the Survey of Residents around Abandoned Metal Mines (2013~2017, n=4,421) and Investigation of Soil Pollution in Abandoned Metal Mines (2000~2011) were used. A random coefficient model was conducted for estimation of the lower level (micro data) of the local resident unit and the upper level (macro data) of the abandoned metal mine unit. Through a fitted model, the variation of blood lead levels among abandoned metal mines was confirmed and the effect of the operationally defined soil contamination level was estimated. Results: Among the total variation in blood lead levels, the variation between abandoned mines was 18.6%, and the variation determined by the upper-level factors such as soil contamination and water contamination was 8.1%, which was statistically significant respectively. There was also a statistically significant difference in the least square mean of blood lead concentration according to the level of soil contamination (p=0.047, low: 2.32 ㎍/dL, middle: 2.38 ㎍/dL, high: 2.59 ㎍/dL). Conclusions: The blood lead concentration of residents living near abandoned metal mines was significantly correlated with the level of soil contamination. Therefore, in biomonitoring for vulnerable areas, operationally defined soil contamination can be used as a predictor for human exposure level to hazardous substances and discrimination of high-risk abandoned metal mines.

Effect of SipJeonDaeBo-Decoction on Target Organ Metal Level in Rats (십전대보탕을 투여한 흰쥐의 중요장기중 금속농도변화에 대한 연구)

  • Yoon Seong-Wook;Lee Sun-Dong
    • Journal of Society of Preventive Korean Medicine
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    • v.4 no.1
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    • pp.51-69
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    • 2000
  • This dissertation was to research how some metal level within SipJeonDaeBo - Decoction, one of oriental prescriptions, influence Sprague-Dawley animals. 1. Under the experiment with drinking waters there was no metal ${\sim}0.65\;mg/L$ detected. A metal with feed found 0.001-376.983mg/kg. 2. In the mice's kidney, brain, bones used experiment, As searched 0.474 mg/kg, 0.486 mg/kg, 0.314 mg/kg 0.834 mg/kg respectively ; Cd 0.060 mg/kg, 0.045 mg/kg, 0.030 mg/kg, 0.353 mg/kg, ; Co 0.105 mg/kg, 0.063 mg/kg, 0.030 mg/kg, 0.399 mg/kg, ; Cr 0.292 mg/kg, 0.304 mg/kg, 0.234 mg/kg, 0.962 mg/kg, ; Cu 4.201 mg/kg, 3.759 mg/kg, 1.923 mg/kg, 0.484 mg/kg, ; Fe 57.535 mg/kg, 150.571 mg/kg, 17.178 mg/kg, 281.506 mg/kg, ; no Hg, Mn 0.612 mg/kg, 2.968 mg/kg, 0.528 mg/kg, 4.205 mg/kg, ; Ni 0.094 mg/kg, 0.072 mg/kg, 0.078 mg/kg, 27.714 mg/kg, ; Pb 0.269 mg/kg, 0.293 mg/kg, 0.283 mg/kg, 43.142 mg/kg ; Zn 4.149 mg/kg, 21.861 mg/kg, 8.088 mg/kg, 226.283 mg/kg respectively. 3. In level of hazardous metal within idney control group searched 0.194 {\pm}\; 0.052 mg/kg, experimental I g개up $0.189{\pm}0.036\;mg/kg$, experimental I group $0.264 {\pm}{\pm}\;0.179\;mg/kg$. In level of non hazardous metal control group searched $15.917{\pm}5.575\;mg/kg$, experiment I group $17.064{\pm}2.246\;mg/kg$, experiment II group $16.892{\pm}3.586\;mg/kg$. Besides in total level of metal control g.cup detected $6.484{\pm}2.258\;mg/kg$, experiment I group $6.940{\pm}0.914\;mg/kg$, experiment II group $6.915{\pm} 1.508\;mg/kg$ There all was no statistical significance. 4. In level of hazardous metal within the liver control group searched $0.187{\pm}0.048\;mg/kg$, experiment I g개up $0.168[\pm}0.079\;mg/kg$, experiment II group $0.277{\pm}0.159\;mg/kg$. In level of non hazardous heavy metal control group detected $44.925{\pm}18.468\;mg/kg$, experiment I group $39.917{\pm}12.772\;mg/kg$, experiment II group $49.525{\pm}33.484\;mg/kg$. Besides in total concentration control group searched $18.082{\pm}7.395\;mg/kg$, experiment I group $16.068{\pm}5.128\;mg/kg$, experiment II group $19.977{\pm}13.443\;mg/kg$. There was no statistical significance but hazardous metal gets more level in the experilnent group than in the control group. 5. In level of hazardous metal within brain control group searched $0.145{\pm}0.056\;mg/kg$, experiment I group $$0.167{\pm}0.030\;mg/kg, erperiment II group $0.172{\pm}0.123\;mg/kg$. In level of non hazardous heavy metal control group detected $6.488{\pm}0.965\;mg/kg$, experiment I group $7.290{\pm}0.588\;mg/kg$, experiment II group $7.010{\pm}1.627\;mg/kg$. Besides in total concentration control group searched $2.683{\pm}7.395\;mg/kg$, experiment I group $3.017{\pm}0.238\;mg/kg$, experiment II group $2.908 {\pm} 0.711\;mg/kg$. Therefore there was no statistical significance. 6. In level of hazardous metal within bone control group searched $8.172{\pm}5.195 \;mg/kg$, experiment I group $9.128{\pm}4.143\;mg/kg$, experiment II group $9.401{\pm}6.924\;mg/kg$. There is statistical significance(p<0.05). In level of non hazardous metal control group detected $94.065{\pm}36.035\;mg/kg$, experiment I group $147.563 {\pm}79.939\;mg/kg$, experiment II group $142.730{\pm}77.374\;mg/kg$. Besides in total level control group searched $48.530{\pm}16.523\;mg/kg$, experiment I group $64.502{\pm}31.078\;mg/kg$, experiment II group $62.733 {\pm}34.641\;mg/kg$. Therefore there was no statistical significance. 7 In the correlative research as to how each metal influences to ingestion Cd and Co searched 0.954 and Pb and Ni -0.0884 from kidney. Co and Cd was 0.995 and Zn and As -0.190 from liver. Co and Cd were 0.995 and Zn and Cu -0.393 from brain. Co and Cd were 0.998 and Zn and Mn -0.206 from bones

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Modality of Heavy Metal Contamination of Soil in Military Rifle Shooting Range (소화기 사격장의 중금속 오염 양상)

  • Lee, Kwang-Lyeol;Hyun, Jae-Hyuk
    • Journal of Soil and Groundwater Environment
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    • v.21 no.3
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    • pp.58-63
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    • 2016
  • The study examined the level of heavy metal contamination by dividing military rifle shooting ranges into the three areas, i.e firing, trajectory, and target. The target area was found to be contaminated at a level higher (Cu 845 mg/kg, Pb 30,487 mg/kg) than the Worrisome Level of Soil Contamination (hereinafter referred to as the “Worrisome Level”) The trajectory area was predicted to be free from contamination, but it did indicate contamination although it was pretty much lower (Cu 23 mg/kg, Pb 99 mg/kg) than Worrisome Level. This is attributed to the contamination spread when rearranging the soil of the target area during the maintenance of the shooting range. The firing area was also predicted to be free from heavy metal contamination, but the results analyzed indicated a contamination higher (Cu 201 mg/kg, Pb 2,286 mg/kg) than Worrisome Level. This is attributed to the fragments of the broken bullet scattering due to the pressure generated as the bullet leaves the muzzle. An examination of heavy metal contamination in the discharge area as well as gutters to prevent the intrusion of rain water from perimeter revealed a high level of contamination (Cu 298 mg/kg, Pb 6,497 mg/kg), which makes it necessary to take measures.

Studies on the Heavy Metal Contents in Cultivated Medicinal Plants and their Correlations with Soils (수종 재배 약용식물과 토양중 중금속 함량에 관한 연구)

  • Yoo, Seung-Jo;Song, Kyung-Sik
    • Korean Journal of Pharmacognosy
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    • v.22 no.1
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    • pp.33-35
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    • 1991
  • Heavy metals may cause trouble(s) in human body. For consideration of the safety of crude drugs cultivated in Korea, we selected some medicinal plants and soils from cultivated site and estimated their heavy metal contents by inductively coupled argon plasma spectrometry (ICAP). Among heavy metals tested, the highest level of Cu and Zn were shown in plants cultivated in Kyung Ki; the highest level of Fe in those in Youngnam and the highest level of Mg and Mn in those in Youngdong. The heavy metal content s were as low as to be permeasible at least for the medicinal plants we selected. There were no significant correlations between heavy metal contents of soils and cultivated medicinal plants.

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Evaluation of The Wear Characteristics on The White Metal Bearing in a Low Speed Two-Stroke Marine Diesel Engine (저속 2행정 박용 기관에서의 LO 입자 오염도에 따른 베어링 마모 특성 평가)

  • Ahn, Y.H.;Kim, D.Y.;Kim, Y.C.;Park, D.J.
    • Proceedings of the Korean Society of Marine Engineers Conference
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    • 2005.11a
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    • pp.21-22
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    • 2005
  • A study on the wear characteristics of the white metal(Sn-base alloy) bearing as a function of particle contamination level was conducted in order to establish control criteria of the lubricant in the 2-stroke marine diesel engine. Particle contamination level of the lubricants ranged from NAS 10 to 12 for the experiments. Bar-on-plate type wear test was performed using reciprocating wear tester. Based on this study it was found that there was no noticeable difference in weight loss of the white metal for NAS10 and NAS11(particle contamination level). Surface roughness of the white metal bearing after the wear test of 8hrs for the highly contaminated lubricant(NAS12 level) was up to $6{\mu}m$ in Rmax whilst that of the less contaminated lubricants(NAS10 & 11) was less than $1.5{\mu}m$ in Rmax.

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Molten Metal Flow Analysis of Casting Process Using SPH Method (SPH 기법을 이용한 주조공정 용탕 주입 유동 해석)

  • Park, Byung Lae;Lee, Sang Wook
    • Journal of the Korean Society of Visualization
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    • v.16 no.1
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    • pp.54-60
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    • 2018
  • It is important to develop more efficient and productive casting processes for an automated high precision molten-metal casting system. Detailed analysis of molten-metal flow in the casting process by the numerical approach will help to optimize the control of a ladle. In this study, the smoothed particle hydrodynamics method was applied to analyze casting flow characteristics with different tilting angular speed and initial molten-metal level. The smoothed particle hydrodynamics technique has advantages to easily handle non-linear free surface behavior with the absence of a computational mesh. We found that tilting angular speed has relatively greater effect on the casting flowrate and that the effect of the initial molten-metal level is only minor. Further extensive study will be necessary to find an optimal condition for high efficient casting system.