Assessment of pesticide residue levels among locally produced fruits and vegetables in Monze district, Zambia

Abstract Background The use of pesticides in fruits and vegetable production is beneficial for preventing, destroying or repelling pests that may damage these crops. The use of these chemicals however, often leads to the presence of residues in the fruits and vegetables after harvest. This study investigated farmers’ compliance to applicable national standards by assessing pesticide residues in selected locally produced fruits and vegetables in two study sites in Monze, Zambia. The study used mixed methods (convergent parallel) design. We procured rape, cabbages, tomato and orange samples from conveniently sampled fruit and vegetable farmers around Hachaanga and St. Mary’s areas in Monze, Zambia. Samples were analyzed for residues of dichlorvos using gas chromatography-mass spectrometry (GC-MS). Estimated average daily intakes (EADI) were calculated using standard formula. We also explored farmers’ practices in dealing with regulatory issues in pesticide use and handling. A total of 14 key informant interviews with farmers, agriculture and public health officers and one policy maker were undertaken using a semi structured interview guide, were voice recorded, later transcribed and analyzed using Nvivo 10 software. Results Results revealed detectable residues in 63.3% of 30 tested samples out of which three samples (one each of cabbage, tomato and orange samples) exceeded the codex Alimentarius maximum residual limit (0.1 mg/kg). However, all samples had residues below the Zambia Food and Drugs standard (0.5 ppm). The EADIs were also below WHO/FAO allowable daily intake recommended in all fruit and vegetable samples; however hazard indices for cabbage and oranges were close to the value one. In regard to farmers’ practices, results showed great variation in pesticide use and handling, limited knowledge, observation of reduced waiting periods and limited monitoring and regulation of pesticide use among farmers. Conclusion Our investigation found that all our samples had residues within the locally applicable regulation limits. All our EADIs were below the FAO/WHO limits. However, farmers’ practices in pesticide use and handling were not conformity to guidelines. Therefore, there is need for educating food producers on handling and hazards of pesticides in Zambia

Current trends of blood lead levels, distribution patterns and exposure variations among household members in Kabwe, Zambia

Childhood lead (Pb) poisoning has devastating effects on neurodevelopment and causes overt clinical signs including convulsions and coma. Health effects including hypertension and various reproductive problems have been reported in adults. Historical Pb mining in Zambia's Kabwe town left a legacy of environmental pollution and childhood Pb poisoning. The current study aimed at establishing the extent of Pb poisoning and exposure differences among family members in Kabwe as well as determining populations at risk and identify children eligible for chelation therapy. Blood samples were collected in July and August 2017 from 1190 household members and Pb was measured using a portable LeadCare-II analyser. Participants included 291 younger children (3-months to 3-years-old), 271 older children (4-9-years-old), 412 mothers and 216 fathers from 13 townships with diverse levels of Pb contamination. The Blood Lead Levels (BLL) ranged from 1.65 to 162 mu g/dL, with residents from Kasanda (mean 45.7 mu g/dL) recording the highest BLL while Hamududu residents recorded the lowest (mean 3.3 mu g/dL). Of the total number of children sampled (n = 562), 23% exceeded the 45 mu g/dL, the threshold required for chelation therapy. A few children (5) exceeded the 100 mu g/dL whereas none of the parents exceeded the 100 mu g/dL value. Children had higher BLL than parents, with peak BLL-recorded at the age of 2-years-old. Lead exposure differences in Kabwe were attributed to distance and direction from the mine, with younger children at highest risk. Exposure levels in parents were equally alarming. For prompt diagnosis and treatment, a portable point-of-care devise such as a LeadCare-II would be preferable in Kabwe. (C) 2019 Elsevier Ltd. All rights reserved