Lead Exposure in Trader Communities in Industrial Area of the Battery Recycling Plant: Tangerang, Indonesia

The aim of this study was to look at the risk of community around the battery recycling plant in terms of the exposure to lead dust. The number of respondents amounted to 60 people from an industrial area and a residential area. The sample of the industrial area included 30 respondents with a composition of 15 men and 15 women. The same number of respondents was also examined in the residential area as a control area, located 5 km from the industrial area. Respirable dust was measured using a personal dust sampler, the concentration of lead in dust was measured using GF-AAS, while as a biomarker of exposure, the lead content in urine was measured using GF-AAS. The average values for respirable lead in industrial and residential areas are 0.92 μg/m3 and 0.92–1.34 μg/m3. The analysis of the lead content in urine for the industrial and residential areas produced an average value of 119 ppb and 123 ppb. The average value of HI for the lead exposure on the industrial and residential areas are in danger (HI> 1) which is 3.6 ± 1.94 and 2.18 ± 1.49. The OR values for the respondents in the industrial area compared to the residential areas amounting to 1.17 for the category of HI lead exposure and 1.22 for the category of lead in urine.


INTRODUCTION
The battery industry is the main consumer of lead from mining (80%), while 50% of the global lead production comes from battery recycling (Gottesfeld 2011;ILZSG). Batteries are used in vehicles, lighting, also in solar panel installations and telecommunication systems for storing energy (Waste 2018; Chen et al. 2009;IC Consultants 2001).
The activity of a battery recycling plant poses a hazard to health. The main danger from battery recycling is lead (Pb) which comes from the destruction of the battery (Lisbona et al. 2011). Pb is a pollutant that can have acute and chronic effects on health. Pb is not bound by other elements, so it has the ability to circulate to all body tissues. In adults, Pb can contribute to heart attacks (cardiotics) and hypertension, whereas brain disorders can occur in children (Jaishankar et al. 2014; Mason et al. 2014).
Lead can have an impact on the central nervous system, the cardiovascular system, the hematopoietic system, slowing psychomotor development, reducing the hearing capacity, and increasing the learning and cognitive capabilities ( The battery recycling proces activities aim to produce lead in the metal form from the automotive batteries that are no longer in use. Each spent battery contains about 8.2 kg of lead, consisting of 40% lead metal and 60% lead oxide. There are 3 stages of processing the spent batteries, involving scrap pretreatment, smelting and refining (Gratz et al. 2014).

METHODS
The stages of preparation are carried out in the form of a location survey to determine the points used as sampling and compilation of the questionnaire. Questionnaires were distributed to determine the respondents to be sampled. The questionnaire given was related to age, weight, length of stay, work time, habits, and the health conditions that might occur due to the exposure to Pb (Chagnes et al. 2015).
Sampling was carried out at the Industrial area in Jatiuwung District, Tangerang. While the area used as a control sample (background) is a residential area in Curug District, Tangerang, which is located 5 km from the industrial area. This research is a cross-sectional epidemiological study (Vinceti et al. 2015;Zuberbier et al. 2010). The total number of samples / respondents collected was 60 samples / respondents, with 30 of them in the industrial areas and 30 in the residential areas (background). The respondents in each region were divided into two by sex, namely 15 men and 15 women.
The measurement of the aspirated dust was carried out using the Gilian HFS-513A Hi Flow Personal Sampler tool equipped with a 25 mm The measurements were made for 4 hours with a flow rate of 2 L/min, which was carried out based on the inorganic lead sampling standards. The measurements were performed on the respondent's breathing zone. Dust quantification was conducted gravimetrically, with filter weight measurements made before and after measurement.. Before the measurement of aspirated dust, the measurement of environmental physics parameters, namely temperature, humidity, pressure, and wind speed is also carried out (

Characteristics of respondents
The characteristics of the respondents involved in this study were obtained through filling in the questionnaire. This characteristic is needed to determine the equivalence between respondents in the industrial areas and the respondents in the residential areas. In addition, the measurement of respondent characteristics is needed in determining the hazard index. The comparison of characteristics of each region can be seen in Tables 1 and 2. It can be seen that each respondent in the two regions has comparable attributes and deserves to be compared.

Environmental physics parameters
The environmental physical parameters are wind speed, humidity, temperature, and air pressure. The environmental physical parameters in each region are shown in Table 3. The probability values (α = 0.05) in Table 3. show that there are no significant differences in terms of the environmental physical parameters between the industrial areas and residential areas.

Hazard index
The hazard index (HI) of the exposure is calculated using the dose value (ADD) compared to the reference value (RfD). The value of RfD for Pb is 1,85×10 -3 mg/kg.day (OMEE, 2010). The dose of aspirated lead exposure is the daily exposure dose (ADD -average daily dose) calculated using Equation 1. In the ADD calculation, the absorption factor value of 100% was used, because the lead is assumed to reach the alveoli and enter the circulatory system (Savic et al. 2016 The average value of the aspirated lead exposure hazard index in each region is shown in Figure 1. The average daily aspirated lead dose for the industrial areas is 0.00731 mg/kg·day, and 0.00514 mg/kg·day for the residential areas. The average HI value is shown in Figure 2. The industrial area is 3.6 ± 1.94, while in the residential areas it is 2.5 ± 0.44. In order to determine the existence of a significant difference between HI values in the industrial and residential areas, a comparative test using an unpaired t test is carried out. The results of the comparative statistical test of the unpaired t test show a probability value (p-value) of 0.042. In the 95% confidence range, a probability value smaller than 0.05 indicates that H 0 is rejected, so it can be concluded that the average HI value of the industrial estate is significantly different from the HI value in the residential area.
The differences in the HI values indicate that the respondents in the industrial areas have a greater risk of exposure to lead compared to the residential areas. The HI values greater than 1, both in the industrial and residential areas, indicate that the respondents in both areas are in dangerous conditions of the Pb exposure.

Lead concentration
The lead concentration in the aspirated dust is shown in Figure 3. The average measured aspiration lead concentration in an industrial area was 1.34 µg/m 3 , while in a residential area, it was 0.92 µg/m 3    A comparative statistical analysis using the unpaired t test in the two regions produced a probability value of 0.047 in the 95% confidence range (α = 5%). The probability value smaller than 0.05 indicates that there is a significant difference between the concentration of lead being absorbed in an industrial area and the concentration of lead aspirated in a residential area (Parks et al. 2014).
The lead concentration in urine is used as a biomarker of exposure. The concentration of lead in urine in each region is shown in Figure 4. The average lead concentration in urine in the   industrial area is 119 ppb with a concentration range of 3-541 ppb while in the residential areas it is 123 ppb with a concentration range of 3-628 ppb. There were 12 respondents in the industrial area that had the lead concentrations in urine exceeding the safety standards according to NJDOH (New Jersey Department of Health, 2010), which is 80 ppb. In turn, in the residential areas there were 9 respondents who exceeded the average lead concentration in safe urine (Matta et al. 2016;NJDOH 2010).
The comparative statistical analysis to compare the urine lead concentrations in the two regions resulted in a probability value of 0,000 in the 95% confidence range. The probability values over 0.05 indicate that there is no significant difference in the concentration of urine lead between the respondents in the industrial areas and those in the residential areas. The absence of this difference indicates that the residential areas, which are dominated by non-industrial activities, cannot be separated from the effects of lead exposure.
The relationship between the lead concentration in urine and the distance of lead pollutant sources is shown in Figure 5. It can be seen that as far as the respondents are from the industrial areas are concerned, the lead concentration in the urine of respondents tends to decrease. However, this relationship is not statistically significant, as it can be caused by the differences in the metabolic rate of respondents, and it can also mean that lead in the urine of the respondent does not only come from the lead emissions caused by the industrial area.

Evaluasi Dosis-Respon
The relationship between the aspirated lead and the lead concentration in urine is shown in Figure 6. The relationship between urine Pb concentration and Pb aspired in the industrial area Figure 6 show a value of R 2 that is much smaller than 1, this shows that only a small portion of urine lead concentration is affected by the amount of the aspirated lead concentration. A correlative statistical analysis using the Pearson correlation test produced the probability values of 0.189 and 0.259. In turn, the Pearson correlation values (r) produced were 0.272 and 0.225. The probability values greater than 0.05 indicate that the relationship between the lead concentration in urine with the aspirated lead concentration is not meaningful, as it occurs both in the industrial and residential areas. In addition to the small number of respondents, the difference in a person's   The lead kinetics in the human body can also be one of the causes that do not appear to be a meaningful relationship between the urine lead and the aspirated lead. The lead that enters the human body will then undergo displacement in the organs or tissues of the body, so not all aspirated lead will be expelled immediately in the form of lead in the urine (Rabinowitz 2016).

CONCLUSION
On the basis of the results obtained in this study, the average value of the lead concentration in the industrial area is higher than in the residential area, but still under the quality standard. In turn, the average HI value of the lead exposure to respiration in the two respondent areas shows a dangerous situation (HI> 1) where the average HI for the industrial and residential areas is 3.6 ± 1.94 and 2.18 ± 1 , 49. With this result, traders and residents around the industrial area are exposed to a dangerous situation of lead exposure.