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The contents of essential and toxic metals in coffee beans and soil in Dale Woreda, Sidama Regional State, Southern Ethiopia

BACKGROUND: For developing countries such as Ethiopia, coffee is a commodity of great economic, social, and environmental importance. No detailed investigations have been performed on the contents of essential and toxic metals in coffee beans and soil in this study area. METHODS: The levels of essen...

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Autores principales: Berego, Yohannes Seifu, Sota, Solomon Sorsa, Ulsido, Mihret, Beyene, Embialle Mengistie
Formato: Online Artículo Texto
Lenguaje:English
Publicado: PeerJ Inc. 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9899437/
https://www.ncbi.nlm.nih.gov/pubmed/36751640
http://dx.doi.org/10.7717/peerj.14789
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author Berego, Yohannes Seifu
Sota, Solomon Sorsa
Ulsido, Mihret
Beyene, Embialle Mengistie
author_facet Berego, Yohannes Seifu
Sota, Solomon Sorsa
Ulsido, Mihret
Beyene, Embialle Mengistie
author_sort Berego, Yohannes Seifu
collection PubMed
description BACKGROUND: For developing countries such as Ethiopia, coffee is a commodity of great economic, social, and environmental importance. No detailed investigations have been performed on the contents of essential and toxic metals in coffee beans and soil in this study area. METHODS: The levels of essential metals (Na, K, Ca, Zn, Mn, Cu, Co, Cr, Ni) and toxic elements (Pb and Cd) were investigated in coffee beans (coffee growing farmland and coffee washed plants) and soil samples (from farmland) using flame atomic absorption spectrometry (FAAS) and flame emission atomic spectroscopy. We selected six (20%) administrative units (kebele) with purposive sampling techniques based on their coffee production capacity in Dale Woreda for soil testing. After coffee sample preparation in a microwave system with HNO(3)and H(2)O(2) reagents, the accuracy of the optimized procedure was evaluated by analysing the digest of the spiked samples. Soil samples were abridged with a slight revision of the EPA 3050B acid digesting method. ANOVA was used to determine the significant differences in the mean concentration of metal within coffee beans from farmland at the various sampled sites at the p < 0.05 significance level. To correlate the effect of one metal concentration on other metals in the coffee bean samples, Pearson correlation matrices were used. RESULTS: Calcium had the highest concentration (1,355 ± 18.02 mg kg(−1)) of macroelements in soil samples, followed by K (681.43 ± 1.52 mg kg(−1)). Similarly, Na (111.63 ± 0.35 mg kg(−1)), Cu (49.96 ± 0.99 mg kg(−1)), Co (5.43 ± 0.31 mg kg(−1)), Mn (0.62 ± 0.238 mg kg(−1)), Ni (0.194 ± 0.01 mg kg(−1)), and Zn (0.163 ± 0.007 mg kg(−1)) were detected among the microelements in the soil samples. Pb and Cr were not detected in all soil samples. Potassium (K) was found to have the highest concentration (99.93 ± 0.037 mg kg(−1)), followed by Ca (17.23 ± 0.36 mg kg(−1)), among the macroelements in coffee beans from farmers’ farms. Similar to coffee beans from farmland, samples from washed plants also contained the highest K (77.93 ± 0.115 mg kg(−1)), followed by Ca (4.33 ± 0.035 mg kg(−1)). Metal levels in coffee bean samples from farmland are in the following order: K>Na>Ca >Mn>Cu> Ni>Zn. Metal levels were found to be K>Na>Ca >Mn>Cu> Zn>Ni in coffee beans from the washed plants. Co, Cr, Pb and Cd were no detected in all coffee bean samples. Except for calcium, potassium and manganese, the levels of metals in coffee beans from farmland and washed plants were not significantly different at the 95% confidence level within a kebele. CONCLUSIONS: We observed permitted levels of macro- and trace elements in coffee beans from farmlands and washed plants. Only in the soil samples are cadmium concentrations higher than those permitted for agricultural soil recommended by the WHO and FAO. Overall, there is no health danger linked with the use of coffee beans due to detrimental and trace heavy metals.
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spelling pubmed-98994372023-02-06 The contents of essential and toxic metals in coffee beans and soil in Dale Woreda, Sidama Regional State, Southern Ethiopia Berego, Yohannes Seifu Sota, Solomon Sorsa Ulsido, Mihret Beyene, Embialle Mengistie PeerJ Plant Science BACKGROUND: For developing countries such as Ethiopia, coffee is a commodity of great economic, social, and environmental importance. No detailed investigations have been performed on the contents of essential and toxic metals in coffee beans and soil in this study area. METHODS: The levels of essential metals (Na, K, Ca, Zn, Mn, Cu, Co, Cr, Ni) and toxic elements (Pb and Cd) were investigated in coffee beans (coffee growing farmland and coffee washed plants) and soil samples (from farmland) using flame atomic absorption spectrometry (FAAS) and flame emission atomic spectroscopy. We selected six (20%) administrative units (kebele) with purposive sampling techniques based on their coffee production capacity in Dale Woreda for soil testing. After coffee sample preparation in a microwave system with HNO(3)and H(2)O(2) reagents, the accuracy of the optimized procedure was evaluated by analysing the digest of the spiked samples. Soil samples were abridged with a slight revision of the EPA 3050B acid digesting method. ANOVA was used to determine the significant differences in the mean concentration of metal within coffee beans from farmland at the various sampled sites at the p < 0.05 significance level. To correlate the effect of one metal concentration on other metals in the coffee bean samples, Pearson correlation matrices were used. RESULTS: Calcium had the highest concentration (1,355 ± 18.02 mg kg(−1)) of macroelements in soil samples, followed by K (681.43 ± 1.52 mg kg(−1)). Similarly, Na (111.63 ± 0.35 mg kg(−1)), Cu (49.96 ± 0.99 mg kg(−1)), Co (5.43 ± 0.31 mg kg(−1)), Mn (0.62 ± 0.238 mg kg(−1)), Ni (0.194 ± 0.01 mg kg(−1)), and Zn (0.163 ± 0.007 mg kg(−1)) were detected among the microelements in the soil samples. Pb and Cr were not detected in all soil samples. Potassium (K) was found to have the highest concentration (99.93 ± 0.037 mg kg(−1)), followed by Ca (17.23 ± 0.36 mg kg(−1)), among the macroelements in coffee beans from farmers’ farms. Similar to coffee beans from farmland, samples from washed plants also contained the highest K (77.93 ± 0.115 mg kg(−1)), followed by Ca (4.33 ± 0.035 mg kg(−1)). Metal levels in coffee bean samples from farmland are in the following order: K>Na>Ca >Mn>Cu> Ni>Zn. Metal levels were found to be K>Na>Ca >Mn>Cu> Zn>Ni in coffee beans from the washed plants. Co, Cr, Pb and Cd were no detected in all coffee bean samples. Except for calcium, potassium and manganese, the levels of metals in coffee beans from farmland and washed plants were not significantly different at the 95% confidence level within a kebele. CONCLUSIONS: We observed permitted levels of macro- and trace elements in coffee beans from farmlands and washed plants. Only in the soil samples are cadmium concentrations higher than those permitted for agricultural soil recommended by the WHO and FAO. Overall, there is no health danger linked with the use of coffee beans due to detrimental and trace heavy metals. PeerJ Inc. 2023-02-02 /pmc/articles/PMC9899437/ /pubmed/36751640 http://dx.doi.org/10.7717/peerj.14789 Text en ©2023 Berego et al. https://creativecommons.org/licenses/by/4.0/This is an open access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, reproduction and adaptation in any medium and for any purpose provided that it is properly attributed. For attribution, the original author(s), title, publication source (PeerJ) and either DOI or URL of the article must be cited.
spellingShingle Plant Science
Berego, Yohannes Seifu
Sota, Solomon Sorsa
Ulsido, Mihret
Beyene, Embialle Mengistie
The contents of essential and toxic metals in coffee beans and soil in Dale Woreda, Sidama Regional State, Southern Ethiopia
title The contents of essential and toxic metals in coffee beans and soil in Dale Woreda, Sidama Regional State, Southern Ethiopia
title_full The contents of essential and toxic metals in coffee beans and soil in Dale Woreda, Sidama Regional State, Southern Ethiopia
title_fullStr The contents of essential and toxic metals in coffee beans and soil in Dale Woreda, Sidama Regional State, Southern Ethiopia
title_full_unstemmed The contents of essential and toxic metals in coffee beans and soil in Dale Woreda, Sidama Regional State, Southern Ethiopia
title_short The contents of essential and toxic metals in coffee beans and soil in Dale Woreda, Sidama Regional State, Southern Ethiopia
title_sort contents of essential and toxic metals in coffee beans and soil in dale woreda, sidama regional state, southern ethiopia
topic Plant Science
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9899437/
https://www.ncbi.nlm.nih.gov/pubmed/36751640
http://dx.doi.org/10.7717/peerj.14789
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