Determination of Organic Matter and Trace Metals Elements (As, Sb, Cd, Hg, Ni, Pb, Cr, Zn) in the Soils of the Banks of Watercourses in Brazzaville City (Republic of Congo)  

作　　者：Mbianda Nfong-Ya Orline Lesley Nzila Jean de Dieu Louzayadio Mvouezolo Raison Félicien Bonazaba Milandou Longin Justin Clair Nguelet-Moukaha Isidore Wando Georgy Patience Ouamba Jean Maurille Aina Martin Pépin Mbianda Nfong-Ya Orline Lesley;Nzila Jean de Dieu;Louzayadio Mvouezolo Raison Félicien;Bonazaba Milandou Longin Justin Clair;Nguelet-Moukaha Isidore;Wando Georgy Patience;Ouamba Jean Maurille;Aina Martin Pépin(Laboratoire des Sciences et Techniques de lEau et de lEnvironnement (LSTEE), Institut National de lEau (INE), Universit dAbomey-Calavi (UAC), Cotonou, Bnin;Unit de Chimie du Vgtal et de la Vie, Facult des Sciences et Techniques, Universit Marien Ngouabi, Brazzaville, Republic of the Congo;Laboratoire de Recherche en Gosciences et Environnement (LARGEN), Ecole Normal Suprieure (ENS), Universit Marien Ngouabi, Brazzaville, Republic of the Congo;cole Normale Suprieure (ENS), Brazzaville, Republic of the Congo;Institut National de Recherche Forestire, Universit Marien Ngouabi, Brazzaville, Republic of the Congo;Facult des Lettres, des Arts, des Lettres et des Sciences Humaines, Universit Marien Ngouabi, Brazzaville, Republic of the Congo)

机构地区：[1]Laboratoire des Sciences et Techniques de lEau et de lEnvironnement (LSTEE), Institut National de lEau (INE), Universit dAbomey-Calavi (UAC), Cotonou, Bnin [2]Unit de Chimie du Vgtal et de la Vie, Facult des Sciences et Techniques, Universit Marien Ngouabi, Brazzaville, Republic of the Congo [3]Laboratoire de Recherche en Gosciences et Environnement (LARGEN), Ecole Normal Suprieure (ENS), Universit Marien Ngouabi, Brazzaville, Republic of the Congo [4]cole Normale Suprieure (ENS), Brazzaville, Republic of the Congo [5]Institut National de Recherche Forestire, Universit Marien Ngouabi, Brazzaville, Republic of the Congo [6]Facult des Lettres, des Arts, des Lettres et des Sciences Humaines, Universit Marien Ngouabi, Brazzaville, Republic of the Congo

出　　处：《Open Journal of Soil Science》2025年第2期156-172,共17页土壤科学期刊(英文)

摘　　要：This work focused on determining the physico-chemical characteristics (pH, carbon and nitrogen) and trace metal elements (TMEs) content (As, Sb, Cd, Hg, Ni, Pb, Cr, Zn) of soils in the Brazzaville city. Soil samples were taken from a depth of 0 to 20 cm using a hand auger on both banks of five tributaries of the Congo River (Djoué, Mfilou, Mfoa, Tsiémé, Djiri) that flow through the city of Brazzaville. 90 sampling points were defined, with 3 points 250 m apart on the banks and located, for each river, at three sites: upstream, midstream and downstream. Finally, 15 composite samples representative of the study area were taken. The average pH values of the water varied between 6.5 and 7.5. These pH values show that the soils studied are neutral. Total carbon content varied between 0.7% (Djiri) and 1.6% (Djoué). Total nitrogen content ranged from 0.08% (Djiri) to 0.12% (Djoué). TMEs contents varied from 0.5 to 1.8 mg/kg for Sb, from 0.5 to 2.5 mg/kg for As, from 0.1 to 0.18 mg/kg for Cd, from 4.2 to 11.3 mg/kg for Cr, from 0.07 to 0.27 mg/kg for Hg, from 0.7 to 2.4 mg/kg for Ni, from 0 to 158 mg/kg for Pb and from 16 to 105 mg/kg for Zn. The lowest TMEs levels were observed in the soils of the Djiri river, while the highest levels were observed in the soils of the Djoué and Tsiémé rivers. The ANOVA and Bonferroni test did not show significant differences in the means of the parameters measured (p > 0.05). The TMEs levels were below the accepted standards (NF U44-041), with the exception of Pb, which had high levels downstream of the Djoué. According to the pollution index values calculated using soil TME content, the soils on the banks of the Djoué river are considered polluted, while those on the banks of the Tsiémé river are moderately polluted, those on the banks of the Mfoa and Mfilou rivers are slightly polluted, and the soils on the banks of Djiri river are unpolluted.This work focused on determining the physico-chemical characteristics (pH, carbon and nitrogen) and trace metal elements (TMEs) content (As, Sb, Cd, Hg, Ni, Pb, Cr, Zn) of soils in the Brazzaville city. Soil samples were taken from a depth of 0 to 20 cm using a hand auger on both banks of five tributaries of the Congo River (Djoué, Mfilou, Mfoa, Tsiémé, Djiri) that flow through the city of Brazzaville. 90 sampling points were defined, with 3 points 250 m apart on the banks and located, for each river, at three sites: upstream, midstream and downstream. Finally, 15 composite samples representative of the study area were taken. The average pH values of the water varied between 6.5 and 7.5. These pH values show that the soils studied are neutral. Total carbon content varied between 0.7% (Djiri) and 1.6% (Djoué). Total nitrogen content ranged from 0.08% (Djiri) to 0.12% (Djoué). TMEs contents varied from 0.5 to 1.8 mg/kg for Sb, from 0.5 to 2.5 mg/kg for As, from 0.1 to 0.18 mg/kg for Cd, from 4.2 to 11.3 mg/kg for Cr, from 0.07 to 0.27 mg/kg for Hg, from 0.7 to 2.4 mg/kg for Ni, from 0 to 158 mg/kg for Pb and from 16 to 105 mg/kg for Zn. The lowest TMEs levels were observed in the soils of the Djiri river, while the highest levels were observed in the soils of the Djoué and Tsiémé rivers. The ANOVA and Bonferroni test did not show significant differences in the means of the parameters measured (p > 0.05). The TMEs levels were below the accepted standards (NF U44-041), with the exception of Pb, which had high levels downstream of the Djoué. According to the pollution index values calculated using soil TME content, the soils on the banks of the Djoué river are considered polluted, while those on the banks of the Tsiémé river are moderately polluted, those on the banks of the Mfoa and Mfilou rivers are slightly polluted, and the soils on the banks of Djiri river are unpolluted.

关 键 词：Carbon Nitrogen Trace Metal Elements Soil BRAZZAVILLE CONGO 

分 类 号：S15[农业科学—土壤学]