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Analysis of Pesticide Residues in Some Market Garden Crops in Santa, North West Cameroon

Journal of Environmental Protection 2022年第5期13卷 331-343页

作者： Taku Sylvie Nteping Mofor Nelson Alakeh Njoyim Estella Buleng Tamungang tita margaret awah Department of Chemistry Faculty of Science The University of Bamenda Bambili Cameroon Department of Civil Engineering and Architecture National Higher Polytechnic Institute (NAHPI) The University of Bamenda Bambili Cameroon Department of Biological Science Faculty of Science The University of Bamenda Bambili Cameroon

The increased use of pesticides in crop production, especially in Santa, has left consumers with great fear and uncertainty regarding the fate of residues after consumption in the human body. This study was aimed at performing a multi-residue analysis of crop samples to detect and quantify pesticide residues present, and thus determine their level of contamination. Twelve (12) crop samples (4 samples each of Solanum tuberosum (Irish potato), Solanum lycopersicum (tomato), Capsicum annum (sweet pepper) and Apium graveolens (celery)), were randomly collected from four villages in Santa. The samples were analyzed using the QuEChERS Buffered AOAC 2007.01 method. The results showed the presence of pesticide residues in 58.3% of the samples. Cypermethrin and chlorpyrifos insecticides were detected, though cypermethrin was found in traces. After quantification, the concentration of chlorpyrifos was determined to be far above the CODEX Maximum Residue Limits (MRLs) in 28.6% of the samples. Samples with this high concentration of chlorpyrifos were: tomato from Pinyin and Baligham (2.0 and 1.8 μg/g respectively), whereas the Codex MRLs for tomato is 1.0 μg/g. This study raised concerns on the contamination of some garden crops by pesticide residues and calls for the assessment of the health situation of consumers and the analysis of pesticide residues in drinking water resources in this area.

关键词： Pesticide Residue Market Garden Crops Contamination Santa

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Assessment of Groundwater Quality for Domestic and Irrigation Purposes in Northern Bamenda (Cameroon)

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Journal of Water Resource and Protection 2021年第1期13卷 1-19页

作者： Alice Magha margaret tita awah Gus Djibril Kouankap Nono Primus Azinwi Tamfuh Pierre Wotchoko Mercy Adoh Veronique Beyala Kamgang Kabeyene Department of Geology Higher Teacher Training College University of Bamenda Bambili Cameroon Department of Biology Higher Teacher Training College University of Bamenda Bambili Cameroon Department of Soil Science Faculty of Agronomy and Agricultural Sciences University of Dschang Dschang Cameroon Department of Mining and Mineral Engineering National Higher Polytechnic Institute University of Bamenda Bambili Cameroon Department of Earth Sciences Higher Teacher Training College University of Ngaoundere Bertoua Cameroon

Safe and reliable drinking water availability constitutes a nightmare in many towns of developing countries and is usually appreciated from its physical appearance without prior knowledge of its chemical and biological properties. This study investigates the suitability of groundwater for domestic and irrigational purposes through physico-chemical and bacteriological analyses in the Northern part of Bamenda Town (Cameroon). Thus, 20 groundwater samples were collected from hand-dug wells and spring sources in September 2018 (rainy season) and February 2019 (dry season) and physico-chemical and bacteriological characteristics were determined. The results revealed that pH ranged from 5.5 to 6.6, thus enabling the classification of the water as slightly acidic. Electrical conductivity varied between 0.01 - 0.06 μS/cm. The relative abundance of ions was such that Ca2+ > K+ > Mg2+ > Na+ for cations and HCO-3 > Cl- > NO-3 > SO-4 for anions. The water types were Ca-Mg-NO3 in both dry and rainy seasons. The results revealed that the mechanisms controlling groundwater chemistry are rock weathering and atmospheric precipitation. Indicator bacteria such as E. coli, Shigella, Enterobacteria, Vibrio, Streptococcus and Staphylococcus were detected in the studied groundwater samples, thus the water sources may pose a threat to public health.

关键词： Reliable Drinking Water Groundwater Quality Spring Sources Chemical Characteristics Bacteriological Characteristics

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Remineralization of a Dystric Ferralsol Using Basalt and Tephra Dusts,Effective Microorganisms Manure and NPK 20-10-10 for Radish(Raphanus sativus)Production in Bamougoum(Cameroon Western Highlands)

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Journal of Environmental & Earth Sciences 2021年第1期3卷 1-15页

作者： Pierre Wotchoko Primus Azinwi Tamfuh margaret awah tita Alice Magha Glory Anonchuh Wonyi Fritz Oben Tabi Dieudonne Bitom Department of Geology Higher Teacher Training College BambiliUniversity of BamendaP.O.Box.39BambiliCameroon Department of Soil Science Faculty of Agronomy and Agricultural SciencesUniversity of DschangP.O.Box.222DschangCameroon Departmentment of Mining and Mineral Engineering National Higher Polytechnic InstituteUniversity of BamendaP.O.Box.39BambiliCameroon Department of Biology Higher Teacher Training CollegeUniversity of BamendaP.O.Box.39BambiliCameroon

This paper studies the effect of basalt and tephra dusts,as alternatives to chemical fertilizers,on soil fertility and Radish(Raphanus sativus)*** experiment was conducted in the field and in the laboratory in the years 2017 and 2018 on two separate plots so as to annul residual effects of fertilizers).The experimental design in the field was a randomized complete block design(56 m^(2)),including five treatments and three replications:control(T_(0)),basalt dust(T_(1)),tephra dust(T_(2)),effective micro-organism(EM)fertilizer(T_(3))and NPK 20-10-10(T_(4)).The main results show the following decreasing trend based on yield:T_(1)>T_(3)>T_(0)>T_(4)>T_(2).The best yields appear in T_(1) and T_(3) probably because they supplied the highest levels of soil nutrients to match the needs of the *** T_(2) plants performed poorly,soil properties like pH.H_(2)O(6.14 to 6.49),sum of exchangeable bases,base saturation,available phosphorus and cation balance were improved after tephra treatment.T_(2) plants might have performed poorly due to intrinsic properties of the tephra dust like low availability of trace elements compared to T_(1) and T_(3).T_(4) plants show the highest number of leaves,leaf area index and plant *** Fe,Mn,Cu and Zn levels in bulbs and leaves will not pose danger of toxicity to human upon consumption and could serve as nutrient supplement for children and expectant *** most profitable treatment is T_(1) permitting to recommend the popularization of basalt dust for radish cultivation as an alternative to chemical fertilizers.

关键词： Raphanus sativus Soil remineralisation Micronutrients Revenue-to-cost ratio Cameroon Western Highlands

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几种重金属离子对Pistia stratiotes叶绿素含量及光合活性的影响(英文)

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浙江大学学报(农业与生命科学版) 1993年第1期 113-119页

作者： D.Omokolo Ndoumou,G.Tsala Ndzomo,M.tita awah 雅温得大学师范学院雅温得大学师范学院雅温得大学师范学院喀麦隆雅温得邮政信箱47号喀麦隆雅温得邮政信箱47号喀麦隆雅温得邮政信箱47号

对在pH6.5时含不同浓度锰、锌、铁和铅的培养液中,预处理3天的Pistia stratiotes 叶片,进行了O2的吸收与释放及其叶绿素a,b含量的测定。结果表明:4种金属离子抑制O2的释放而促进叶片对O2的吸收。锌预处理可以提高叶绿素a,b的含量,而铅... 详细信息

对在pH6.5时含不同浓度锰、锌、铁和铅的培养液中,预处理3天的Pistia stratiotes 叶片,进行了O2的吸收与释放及其叶绿素a,b含量的测定。结果表明:4种金属离子抑制O2的释放而促进叶片对O2的吸收。锌预处理可以提高叶绿素a,b的含量,而铅使叶绿素含量减少。用铁和锰处理时,可使叶绿素a积累而叶绿素b减少。上述结果意味着金属离子防碍叶绿素的形成及光合电子的转移。

关键词： Pistia stratiotes 重金属污水呼吸作用植物净化叶绿素光合作用

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