The effects of major cations in soils, soil : extractant ratio, and EDTA : lead stoichiometric ratio on the extraction efficiency of lead using EDTA were studied for 4 different actual lead-contaminated soils and one artificially lead-contaminated soil. Extraction of lead from the lead-contaminated soil was not affected by a soil : extractant ratio as low as 1 : 3 but instead was dependent on the quantity of EDTA present. Results of the experiments showed that the extraction efficiency for each soil was different, but if sufficiently large amount of EDTA was applied, all the lead may be extracted except for a soil from lead mining area. The differences in extraction efficiencies nay be due to the major cations present in soils which may compete with lead for active sites on EDTA. The total molar amount of major cations extracted was as muck as 20 times more than the added molar amount of EDTA. For some of the soils tested, the extraction efficiency of lead may be affected by being occluded in the Fe and Mn oxides present in the soil. While major cations present in the soil may be one of the factors affecting lead extraction efficiency, the type of lead species present may also play a role. When these factors affect severely, the using of EDTA to extract lead from lead-contaminated soil might be non-effective method.
For accurate and easily shielding irregular shaped organ, its minimized penumbra region and a low melting point alloy 'Lead Y' and synchronizing instrument have been developed. The 'Lead Y' is the quaternary eutectic alloy and it is composed of Lead 30.0% Tin 11.5% Bismuth 48 5% Cadmium 10.0% The density of its at $22^{\circ}C$ is $9.8g/cm^3$ and the melting temperature has $40^{\circ}C\;to\;68^{\circ}C$. The thickness of 'Lead Y' for perfect shielding of Co-60 gamma ray and LINAC 10MeV x-ray is 6cm and 7cm respectively. The 'Lead Y' shielding block is casted directly on the styrofoam from which is cut with hot wire of synchronizer device. The special features and advantages of the Lead Y shielding block could be summarized as follows; 1. The shielding block for radiotherapy is rapidly processed only with boiling water and styrofoam. 2. It is not injure one's health and not danger of a fire, because of not generating of any metals vapor and evil smelling. 3. It is very effective to minimize secondary penumbra for the protection of healthy tissue from unnecessary ionizing radiation regardless of the magnification source to skin distance. 4. The HVL of the Lead Y is 1.2cm for Co-60 gamma ray and it's shielding effect is almost same as the pure lead block. 5. The hardness of Lead Y is 1.5 times higher than lead block. 6. It's reavailability is higher than lead block and then one block of Lead Y is reavailable about 30 to 40 times. 7. It is usefull for shielding of x-ray, gamma ray, beta-ray, electron and neutron radiation. 8. The materials for Lead Y are easy to acquire with reasonable price and tractable.
This study was performed to investigate the effect of lactose in 4 different concentrations against the protective effect of calcium on the acute lead poisoning in rats after 4 weeks treatment. In this animal experiment, 70 albino male weanling rats (50-70g of body weight) of Sprague-Dawley strain were used. Lead was dissolved in the distilled water and intubated at the dose of 400mg lead (as acetate)/ kg of body weight/day. Calcium and lactose were administered in drinking water ad libiturn dissolved with the solution of 0.7% calcium gluconate mixed with 40, 80, 160 and 320mM lacotse respectively. The results obtained were summarized as follows: 1. The rate of body weight gain in all treated groups turned out to be lower than that in the control group during 4 weeks treatment. The slow-down of body weight gain was the most significantly observed in the group treated with lead only ( p < 0.05). 2. The relative spleen weight in lead only treated group was significantly lower than that of lead + calcium, lead + calcium + 80mM lactose treated group ( p < 0.05). 3. The value of RBC, WBC, Hb and Hct showed a decreasing tendency in the group treated with lead only ( p < 0.05), however, a significant decrease was not observed in the group treated with lead + calcium. On the other hand, the protective effect of calcium was deteriorated in the group treated with lead + calcium + lactose. 4. The activity of $\delta$-aminolevulinic acid dehydratase ($\delta$-ALAD activity) showed the same tendency as No. 2. 5. The lead concentration in the blood (PbB) showed an increasing tendency and the interrelation among the different groups was also identical with No. 2. 6. With a statistical approach, it was found out that the activity of $\delta$-ALAD and the lead concentration in the blood show a relation of inverse proportion(r=-0.7301). The diagram was interpreted with the logarithmic equation InY = 5.5357-0.0251X (X:PbB, Y:$\delta$-ALAD activity). 7. In the histopathological findings of the kidney, the protective effect of calcium was observed. However, the protective effect of calcium was restricted in the group treated with lead + calcium + lactose. As a conclusion, the intensity of the acute ingested lead poisoning was obviously reduced by calcium, however, the protective effect of calcium was deteriorated in proportion with the concentration of the lactose to be administered. On the other hand, it was also noted that the deterioration was lightly restrained in the group treated with the physiological concentration of 80mM lactose than the results shown in the groups treated with lactose of other concentrations.
This study was carried out to evaluate the relationship between the biological lead exposure indices and air lead concentrations measured by personal air samplers. The 72 occupationally lead exposed workers were observed and the bioiogical lead Exposure indices chosen for this study were blood lead(PbB), urine lead(PbU), zinc protoporphyrin in whole blood(ZPP), $\delta$-aminolevulinic acid in urine(ALAU), $\delta$-aminolevulinic acid dehydratase activity (ALAD), coproporphyrin in urine(CPU) and hemoglobin(Hb). The workers were divided into four groups by air lead concentrations: Group I; under $0.05mg/m^3$, Group II; $0.05-0.10mg/m^3$, Group III; $0.10-0.15mg/m^3$ and Group IV; and over $0.15mg/m^3$. For evaluation the relationship between the biological lead exposure indices and air lead concentrations was used as correlation coefficients. The results obtained were as follows: 1. In Group I, II, III and IV, the mean value of PbB were $25.45{\pm}1.84{\mu}g/dl,\;27.87{\pm}3.53{\mu}g/dl,\;31.21{\pm}1.76{\mu}g/dl\;and\;47.02{\pm}13.96{\mu}g/dl$. Between Group IV and other groups showed statistically significant difference(p<0.05). 2. There was an increasing tendency of PbB, PbU, ALAU and ZPP according to the increase the mean air lead concentration, while ALAD has decreasing tendency. CPU and Hb did not show any constant tendency. 3. Correlation coefficients between PbB, PbU, ZPP, ALAU, ALAD, CPU, Hb and air lead concentration were 0.95, 0.83, 0.89, 0.72, -0.83, 0.51 and -0.45 respectively, and regression coefficient between PbB(Y) and PbA(X) was Y=126.8746X+16.9996(p<0.01).
Kim, Nam-Soo;Kim, Jin-Ho;Lee, Kap-Soo;Lee, Sung-Soo;Kim, Hwa-Sung;Ahn, Kyu-Dong;Schwartz, Brian S.;Lee, Byung-Kook
Journal of Korean Society of Occupational and Environmental Hygiene
/
v.16
no.2
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pp.152-160
/
2006
Genotype of ALAD and VDR yields two alleles, respectively and it has been implicated in susceptibility to lead toxicity. Also genotype known to variety by race. To evaluate the genetic susceptibility of ALAD and VDR gene on health effect of lead exposure, this study was done with new workers who entered lead industries from 1992 to 2001. Among database of lead industries of Soonchunhyang University Institute of Industrial Medicine, only new workers were selected for this study. The total of eligible workers for this category was 3,540 workers including non lead exposed workers of same lead industries. Genotype of ALAD and VDR were measured from stored blood in specimen bank of Soonchunhyang University, blood lead and other relevant information were obtained from database of each workers which were gathered at their first year of employment. Among 3,540 new employed study subjects during period of 1992-2001, 3204 workers(90.5%) had ALAD genotype 1-1; whereas 336 workers(9.5%) had variant type of ALAD (1-2 or 2-2). Lead exposed workers, 9.8%(n=243) male and 8.1%(n=16) female were heterozygous for the ALAD allele. Also non lead exposed workers, 8.9%(n=67) male and 9.3%(n=10) female were heterozygous for the ALAD allele. For VDR genotype, 2,903 workers(89.7%) out of total tested 3,238 workers were belonged to type bb and 335 workers(10.3%) were type bB or BB. Lead exposed workers, 10.4%(n=235) male and 12.2%(n=24) female were heterozygous for the VDR allele. Also non lead exposed workers, 9.2%(n=64) male and 12.5%(n=12) female were heterozygous for the VDR allele. No significant differences were seen in mean blood lead levels by ALAD and VDR genotype, nor was significantly associated with blood lead except age in multiple regression analysis.
In order to investigate the level of lead exposure of workers in litharge making industry and to evaluate how lead exposure, personal habit such as smoking and drinking affect the prevalence of lead related symptoms and other study variables, we investigate 114 workers(24 office workers and 90 lead exposed workers) in a litharge making industry. Study variables chosen were blood lead(PbB), zinc protoporphyrin in whole blood(ZPP), Hemoglobin(Hb), hematocrit (Hct), SGOT and SGPT symptom questionnaires which had 15 lead exposure related symptoms were provided to all workers and filled up by themselves and reconfirmed by physician. The results obtained were as follows; 1. The mean value of PbB, ZPP and SGOT in lead exposed group were higher than those of non-exposed group, and there were no differences of means in other study variables. 2. The smoking and drinking rate of study subjects were 65.8% and 71.0% as a whole. Smoking rates were lower in non-exposed group than exposed group, but drinking rate were not. 3. There were no differences of mean values of study variables between smoker and non-smoker in non-exposed and exposed group, but there was a difference of mean value of SGOT between drinker and lion-drinker in lead exposed group. 4. While the symptom prevalence of lead exposed group were higher in neuromuscular category than non-exposed group, those of non-exposed group were higher or same with exposed group in gastrointestinal and general symptom category. 5. The symptom prevalence of smoker were higher than non-smoker regardless of exposure. 6. The symptom prevalence of drinker were only higher in gastrointestinal symptom category than non-drinker. 7. In multiple stepwise regression analysis of lead related symptoms as dependent variable and blood lead, smoking habit, drinking habit and work duration as independent variables, drinking habit contributed to the gastrointestinal symptom category, whereas blood lead and smoking contributed to the neuromuscular symptom category. For the total symptoms work duration and smoking habit contributed significantly.
Park, Changhwan;Park, Yunkyung;Oh, Younhee;Choi, Inja;Cha, Wonseok;Choi, Sangjun
Journal of Korean Society of Occupational and Environmental Hygiene
/
v.29
no.1
/
pp.34-41
/
2019
Objective: This study is conducted to evaluate airborne lead concentration in and around lead production plant. Methods: Airborne lead concentration was monitored simultaneously inside of the processes of lead recycling factory and outside of factory which include stack, boundary of factory and residential area 1 km and 7.5 km from factory, respectively. All samples were measured three times at 1.5 m from the ground and analyzed using inductively coupled plasma mass spectrometer, inductively coupled plasma optical emission spectrometer or flame atomic absorption spectrometer. Results: All airborne lead concentrations measured inside of factory($13.9{\mu}g/m^3-252.9{\mu}g/m^3$) and outside of factory($0.001{\mu}g/m^3-54.97{\mu}g/m^3$) showed log-normal distribution. Geometric mean lead concentration, $54.81{\mu}g/m^3$, measured inside of factory was significantly higher than outside of factory, $0.20{\mu}g/m^3$(p<0.01). Among the samples measured inside the factory, lead concentration was the highest in the refining process($59.02{\mu}g/m^3-252.9{\mu}g/m^3$). In the case of the samples outside the factory, the nearest chimney was the highest($3.84{\mu}g/m^3-54.97{\mu}g/m^3$), and the lead concentration at the farthest place, 7.5 km from the factory was the lowest($0.001{\mu}g/m^3-1.7{\mu}g/m^3$). The arithmetic lead concentration, $0.45{\mu}g/m^3$ in the residential area near the factory was below the atmospheric environment standard of $0.5{\mu}g/m^3$, but the maximum concentration of $3.4{\mu}g/m^3$ was exceeded. Conclusions: Airborne lead concentration in residential area, 1 km away from lead recycling plant, may exceed ambient air standard of $0.5{\mu}g/m^3$.
This study was performed to investigate the effects of Ethanol on the lead poisoning in rats. For this experiment, 48 male Sprague-Dawley strain were used. The experimental groups were divided into six: a normal control(Control), 200 mg/kg b.w. lead(Pd), 5% ethanol(E5), 10% ethanol(E10), 200 mg/kg b.w. lead plus 5% ethanol(PE5) and 200 mg/kg b.w. lead plus 10% ethanol(PE10). Lead was dissolved in the distilled water and administered orally. Ethanol was given with drinking water ad libitum. The rats were allocated to each group by 8 and sacrificed for 5 weeks. The results were as follows: 1. The mean body weight of each group were increased constantly in all groups during experimental period, but the values of ethanol treatment groups were higher than that of control (Control), lead treatment group(Pb) (P<0.01). 2. Compared to Control and Pb, the relative weight of liver and brain were increased in all the ethanol fed groups. But the relative weight of organs were not observed significantly. 3. The lead concentration of organs were high in the group treated with lead(Pb, PES, PE10) (P<0.01), and PE5, PE10 were high compared with Pb in brain especially(P<0.01). However, no statistical significance were showed between PE5 and PE10. 4. The concentration of serum ALT was increased by lead plus ethanol (PE5, PE10) significantly (P<0.01). 5. The concentration of Hematocrit, hemoglobin, WBC and RBC were not observed difference significantly in all groups.
For the purpose of the curative effects of oral D-penicillamine in lead poisoning, D-penicillamine was orally administered to 7 lead poisoned workers which were employed in glaze product industry dealing with the lead oxide ($Pb_3O_4$). The doses of D-penicillamine was 1,200mg per day which was administered by oral 7days schedules, taking for 5 days and stopping for the following 2days, repeatedly during 3 months period. (All the poisoned workers started working again in that industry after 1 month treatment, and were treated by oral D-penicillamine for 2 months still being exposed to contaminated environment.) In order to evaluate the curative effects of D-penicillamine, 10gm of whole blood and 24 hours urine were collected every 14 days during the curative period for laboratory analysis(hemoglobin, blood lead, urine $\sigma$-aminolevulinic acid, urine coproporphyrin, and urine lead levels) with the observation of the clinical symptoms. The results were as follows; 1. Oral D-penicillamine effected good curative results as that hemoglobin, blood lead, urine $\sigma$-aminolevulinic acid, and urine coproporphyrin levels were decreased below the critical level within 1 month treatment. 2. After re-exposure, oral D-penicillamine effected to some extent as that urine lead level was decreased below the critical level after 3 months treatment with disappearence of the clinical symptoms after 2 months treatment. However, the curative effects of oral D-penicillamine in the lead exposure state is questionable since increasement of blood lead level and remarkable decreasement of urine lead level after 3 months treatment can be observed.
Seo, Jeong-Wook;Kim, Byoung-Gwon;Kim, Yu-Mi;Choe, Byeong-Moo;Seo, Sang-Min;Hong, Young-Seoub
Journal of Environmental Health Sciences
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v.44
no.4
/
pp.380-390
/
2018
Objective: A significant association between blood lead levels and hypertension has been reported in many studies. The relationship between cadmium and hypertension has been debated as well. We aimed to study the association of lead, cadmium, and both with hypertension in the Korean general population. Methods: We examined 5,967 adult men and 6,074 women who participated in the Korea National Health and Nutrition Examination Survey III-VI (2005, 2008-2013 years). Logistic regression models were used to examine the relationship between blood lead concentration and blood cadmium concentration and hypertension using logtransformed blood lead and cadmium concentrations as independent variables after covariate adjustment. Results: Adjusted for general characteristics, the odds ratio of log-lead to hypertension was 2.71 (1.82-4.03), and log-cadmium to hypertension was 2.52 (1.83-3.47). Estimates were found to be statistically significant (p<0.001). When a multiple logistic model was applied, the odds ratio of log-lead and log-cadmium for hypertension were 2.24 (1.50-3.36) and 2.24 (1.62-3.10), respectively. The standardized estimate coefficients of log-lead and logcadmium for hypertension were 4.77 and 6.65, respectively. Conclusion: We observed the association of blood lead concentration, blood cadmium concentration, and both with hypertension. This study suggests that exposure to lead and exposure to cadmium are both risk factors for hypertension.
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