Browsing by Author "Senarathne, E. M. N. S."

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Arsenic contamination in Sri Lankan traditional rice varieties in Anuradhapura district and probabilistic assessment of human health risk through rice consumption
(Faculty of Science, University of Kelaniya, Sri Lanka, 2021) Senarathne, E. M. N. S.; Edirisinghe, E. M. R. K. B.
Arsenic (As) is one of major hazardous carcinogen found in foods and identified as a significant public health concern. Diet and lifestyle of Sri Lankans are mainly relied on rice. Nowadays high demand for traditional rice can be distinguished in the market. The study was aimed to determine the As contamination in Sri Lankan traditional rice varieties and to assess the adverse health effect on human through consumption of these varieties. Twenty four rice varieties were collected from local farmers, Anuradhapura district in the North Central province of Sri Lanka. Rice samples were taken without husks and dry weights were considered. Digestion procedure was carried out using microwave digestion system prior to the analysis. Total As levels were detected using Inductively Coupled Plasma Mass Spectrometry (ICP-MS). Results were verified using a certified reference material (NMIJ 7503b) with 98% recovery. As concentration detected between 39.92 (± 0.10) µg/kg to 543.00 (± 3.10) µg/kg and maximum level was reported in Rathdel while Kuruluthuda showed the lowest concentration. Ten rice varieties including Madathawalu (265.75 ± 4.34) µg/kg , Dik Wee (257.73 ± 2.90) µg/kg, Goda Heenati (249.88 ± 0.50) µg/kg, Rathu Heenati (238.65 ± 3.40) µg/kg, Kiri Murunga (268.04 ± 14.96) µg/kg, Hondaruwal (204.09 ± 6.52) µg/kg, Gurusinghe Wee (251.91 ± 6.03) µg/kg, Gonabaru (274.86 ± 2.50) µg/kg, Al Wee (284.71 ± 7.90) µg/kg and Rathdel (543.40 ± 3.10) µg/kg exceeded the maximum allowable concentration of As in rice (200 µg/kg). There was a significant difference between As amount of Rathdel with that of all the other varieties (P<0.005). Health risk assessment was performed based on the Estimated Daily Intake (EDI) and Hazard Quotient (HQ). EDI for all the rice varieties were within the tolerable daily intake reference limit for As. Noncarcinogenic risk of As was evaluated by HQ value and it was increased in the order, Al Wee < Bada Heenati < Beheth Heenati < Dahanala < Dik Wee < Duru Wee < Goda Heenati < Gonabaru < Gurusinghe Wee < Handiran < Hondaruwal < Kalu Heenati < Kalu Murunga < Kiri Murunga < Kiri Naran < Kurulu Thuda < Madathawalu < Marjuana < Pushparaga < Rath Suwandel < Rathdel < Rathu Heenati < Sudu Heenati < Suwandel. However, all the HQ values were lower than 1 indicating no carcinogenic health risk. Even though ten varieties exceeded the maximum allowable limit, overall health risk assessment confirmed that the consumers are safe to consume rice of these native varieties.
Quantification and health risk assessment of cadmium and lead content in skin creams sold in the Sri Lankan market.
(Faculty of Science, University of Kelaniya Sri Lanka, 2023) Senarathne, E. M. N. S.; Edirisinghe, E. M. R. K. B.
Across history, humans used diverse personal care products with a rising global demand over time. Mineral pigments, frequently employed in colored cosmetics, represent a prominent origin of heavy metal contamination within cosmetic products. Increased exposure to heavy metals can trigger adverse health effects. This study aims to analyze Cd and Pb concentrations in skin creams in Sri Lankan market, as well as to evaluate the health implications linked to metal exposure. Skin creams were collected from 21 brands, comprising whitening (3), face (8), body lotions (7), and baby creams (3) categories. Identities were anonymized with codes (W1-W3, F1-F8, L1-L7, B1-B3). Samples were digested and subjected to metal analysis via Inductively Coupled Plasma Mass Spectrometry (ICP-MS). Potential health risks were assessed by analyzing Hazard Quotient (HQ), Hazard Index (HI), and incremental lifetime cancer risk (ILCR). Cd concentrations ranged from 0.013 ± 0.001 to 0.085 ± 0.011 mg kg-1 (mean: 0.039 ± 0.002 mg kg-1) and Pb levels varied from below the limit of quantification (ND) to 1.066 ± 0.047 mg kg-1 (mean: 0.146 ± 0.006 mg kg-1). The average Cd levels in whitening creams, face creams, body lotions, and baby creams were found to range from 0.064 ± 0.002 (W3) to 0.085 ± 0.011 (W2), 0.013 ± 0.001 (F6) to 0.047 ± 0.002 (F4), 0.026 ± 0.001 (L7) to 0.051 ± 0.001 (L3) and 0.020 ± 0.001 (B3) to 0.055 ± 0.001 (B1) mg kg-1, respectively. In whitening creams, face creams, body lotions, and baby creams, the average Pb levels ranged from 0.343 ± 0.062 (W2) to 1.066 ± 0.047 (W3), from ND in case of F7 and F8 to 0.108 ± 0.001 (F6) mg kg-1, from ND in L2, L3, L4, and L6 to 0.203 ± 0.002 (L5) and from ND in B1 and B2 to 0.026 ± 0.002 (B3) mg kg-1, respectively. All Cd values met Canadian (3 mg kg-1) and Germany (5 mg kg-1) standards while Pb levels stayed below Canadian (10 mg kg-1) and USFDA (20 mg kg-1) thresholds. For Cd, W2 had the highest HQ (2.826 x 10-9), while W3 obtained the highest HQ (0.042 x 10-9) for Pb. No significant health risk was found for any sample, implying minimal consumer impact. Cumulative HI was below one, indicating no adverse effects. Cd and Pb ILCR values ranged from 1.273 x 10-11 to 8.619 x 10-11 for Cd and ND to 15.030 x 10-11 for Pb, highest in W2 and W3 respectively. The analysis of Cd and Pb concentrations in various brands has shown minimal levels, consistently below the limits set by regulatory authorities. Evaluation of health risk indicates that their presence remains within acceptable parameters. While frequent dermal contact is not expected to pose a cancer risk for the studied heavy metals, excessive use could lead to long-term health issues. However, it is recommended to maintain continuous monitoring and the presence of other heavy metals in cosmetics, while strictly adhering to established safety thresholds