Plants need cobalt (Co) for nitrogen fixation and encourage seedling growth. If the amount is excessive, cobalt causes a reduction in crop yield and poisoning. This study aims was to monitor the toxicity levels of cobalt in paddy fields. The study was conducted in the lowland rice fields of Karawang and Bekasi regencies by taking 394 samples of topsoil. The soil samples were collected by survey method. The analysis showed that all samples contained total cobalt, ranging from 0.477 to 31.829 ppm. The data is classified into 3 classes, namely: normal, normal-toxic and toxic under the quality standards of heavy metals in the soil [7]. The classification results showed that 391 samples are categorized as the normal class, 3 samples as the normal-toxic class, and there was no sample categorized as toxic class. The results of this study can be use as a reference for stakeholders to conduct land management to avoid cobalt poisoning.

This research measures the lead, cadmium, copper, nickel, chromium, and arsenic in the paddy fields in Nganjuk Regency. Moreover, this research identifies the effect of these metals to the environment and their location. 105 topsoil samples were collected. The AAS was utilized to ascertain the elemental composition of the soil samples. Numerous soil pollution and ecological risk indices, such as Igeo, PI, IPI, PLI, and PERI, were used to analyze the situation. Spline interpolation with ArcGIS 10.2 was used to study metal distribution. The metal content (mg/kg) in Pb, Cd, Co, Ni, Cr, and As was 10.01, 0.77, 9.60, 5.46, 3.61, and 2.79, respectively. These pollutants had pollution index values of between 0.59 and 2.56 and 0.05 and 0.56 on the lower end of the scale. With an average of 1.10−6, the pollutant load index suggests that all samples are safe. The paddy fields in the research region have an average PERI score of 91.48, indicating a low ecological risk. Most metals researched under agriculturally safe levels will be highly valuable for establishing control and remediation measures in paddy fields.

Excessive use of fertilizers and pesticides causes the accumulation of heavy metals in intensive agricultural land. Besides, the development of industries around the agricultural area further aggravates the accumulation of heavy metals. This study aimed to assess spatial distribution of heavy metal contamination in agricultural land in Bandung District. In this study, seven concentrations of heavy metals (Cr, Pb, Cd, Co, Cu, Ni, and Zn) in soils were analysed from 273 sampling sites in paddy and horticultural lands in Bandung Regency, Indonesia. The single pollution index (PI) and the Nemerow Integrated Pollution Index (NIPI) were calculated for each surface sample (0-20 cm) to assess the level of heavy metal pollution. Ordinary Krigging (OK) method was used to delineate the spatial distribution of heavy metals. The results show that the average values of all PIs and NIPI values are at a safe level, except for cobalt which showing slightly polluted. The analysis showed that around 3.23 and 8.76% of soil samples were slightly contaminated with cadmium and cobalt, respectively. The finding can be used as a reference for stakeholders to manage paddy fields against heavy metal contamination.

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Latar belakang: Beras merupakan salah satu makanan pokok masyarakat Indonesia sehingga perlu adanya jaminan keamanan pada beras khususnya bebas dari cemaran logam berat. Penelitian ini bertujuan untuk mengetahui kandungan konsentrasi logam berat pada beras yang ditanam pada lahan pertanian di Kabupaten Bandung dan menganalisis risiko kesehatan masyarakat yang mengkonsumsi beras tersebut.Metode: penentuan lokasi pengambilan contoh dilakukan dengan metode purposive sampling pada lahan pertanian yang siap panen di beberapa kecamatan di Kabupaten Bandung dengan jumlah contoh beras sebanyak 26 sampel. Analisis logam berat yang dilakukan adalah analisis logam berat Pb, Cd, Cr, Ni, Co, Cu dan Zn dengan ekstrak HNO3:HClO4 dan diukur menggunakan Atomic Absorbption Spectrophotometer (AAS). Analisis probabilistik penilaian risiko kesehatan masyarakat dilakukan dengan menganalisis nilai estimated daily intake (EDI), estimated weekly intake (EWI), risiko non-karsinogenik dan risiko karsinogenik. Hasil: semua contoh beras mengandung logam berat Cr, Co, Cu dan Zn dengan nilai konsentrasi berturut-turut berkisar antara 0.64-2.28 mgkg-1, 1.18-2.66 mgkg-1, 0.64-3.47 mgkg-1 dan 5.44-8.69 mgkg-1. Konsentrasi logam Cu pada contoh beras yang diambil pada lahan pertanian kawasan industri berbeda nyata dengan contoh beras di luar kawasan industri dengan nilai p sebesar 0.014. Risiko non-karsinogenik yang ditimbulkan jika mengkonsumsi beras dari lahan pertanian Kabupaten Bandung tidak mungkin untuk terjadi karena nilai hazard index (HI) menunjukkan angka <1, nilai HI secara berurutan yaitu anak-anak (0.0880)>remaja (0.0370)>dewasa (0.0259)>manula (0.0281) dan risiko karsinogenik juga menunjukkan nilai yang dapat ditoleransi karena di bawah 10-4 untuk semua katogeri umur (anak-anak, remaja, dewasa, manula) dengan nilai cancer risk (CR) berturut-turut sebesar 6.15x10-7, 6.72x10-7, 2.53x10-6 dan 2.74x10-6.Simpulan: beras yang dihasilkan dari lahan pertanian di Kabupaten Bandung aman untuk dikonsumsi oleh masyarakat karena risiko kesehatan yang ditimbulkan masih dapat ditoleransi ABSTRACTTitle: Heavy Metals and Probabilistic Risk Assessment Via Rice Consumption From Rice Fields in Upstream of The Citarum River Background: Rice is one of the staple foods of the Indonesian people, so it is necessary to guarantee the safety of rice, especially free from heavy metal contamination. This study aims to determine the concentration of heavy metals in rice grown on agricultural land in Bandung Regency and analyze the health risks of the people who consume the rice. Method: the determination of location of sampling was carried out by purposive sampling method on agricultural land that was ready for harvest in several sub-districts in Bandung Regency with a total of 26 samples of rice. Heavy metal analysis carried out was heavy metal analysis of Pb, Cd, Cr, Ni, Co, Cu and Zn with HNO3:HClO4 extract and measured using Atomic Absorption Spectrophotometer (AAS). Probabilistic analysis of public health risk assessment was carried out by analyzing the estimated daily intake (EDI), estimated weekly intake (EWI), non-carcinogenic risk and carcinogenic risk.Results: all rice samples contained Cr, Co, Cu and Zn metals with concentration values ranging from 0.64-2.28 mgkg-1, 1.18-2.66 mgkg-1, 0.64-3.47 mgkg-1 and 5.44-8.69 mgkg-1, respectively. The concentration of Cu metal in rice samples taken on agricultural land in industrial areas was significantly different from rice samples outside industrial areas with a p value of 0.01. The non-carcinogenic risk caused by consuming rice from agricultural land in Bandung Regency is unlikely to occur because the hazard index (HI) value shows the number <1, the HI values are children (0.0880)>adolescents (0.0370)>adults (0.0259 )> the elderly (0.0281) and the carcinogenic risk also shows a value that can be tolerated because it was below 10-4 for all age categories (children, adolescents, adults and the elderly) with a cancer risk (CR) value of 6.15x10-7, 6.72x10-7, 2.53x10-6 and 2.74x10-6.Conclution: Rice produced from agricultural land in Bandung Regency is safe for consumption by the community because the health risks caused are still tolerable.

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Introduction: Shallots are one of the horticultural products in great demand by the public. Excessive heavy metal content in shallot will affect people's health who consume it. This study examines the health risks of the people who consume shallot products produced in Srigading Village. Methods: Determination of sampling locations was carried out by purposive sampling method on shallot cultivation land that was ready to harvest, as many as 30 points, in September 2021. Soil and shallot samples were tested for the heavy metal content of Pb, Cd, Co, and Ni. The public health risk assessment was analyzed by looking at the Transfer Factor (TF) value, daily intake, health risk index, hazard index, and cancer risk. Results and Discussion: The concentration of heavy metals in shallots is Pb 19.14 – 30.04 mg kg-1, Cd 1.03 – 2.21 mg kg-1, Co 8.58 – 15.08 ppm, and Ni 6.00 – 10.09 mg kg-1. The average value of Transfer Factor (TF) shows metal uptake by shallots with metal levels Cd (1.07) > Pb (1.03) > Ni (0.73) > Co (0.46). The average daily dose shows that the daily consumption in children is higher than the daily dose for adults. Conclusion: Children are more at risk of being exposed to heavy metals compared to adults in consuming shallots based on the hazard index value. The continuous use of chemical fertilizers and chemical pesticides in shallot farming must be controlled to prevent the increase of accumulation of heavy metals in land and agricultural products.