Lethal yellowing disease: insights from predicting potential distribution under different climate change scenarios     

Aidoo  Owusu Fordjour  Cunze  Sarah  Guimapi  Ritter A.  Arhin  Linda  Ablormeti  Fred Kormla  Tettey  Elizabeth  Dampare  Frank  Afram  Yayra  Bonsu  Osei  Obeng  Joshua  Lutuf  Hanif  Dickinson  Matthew  Yankey  Ndede 《植物病害和植物保护杂志》2021,128(5):1313-1325

Journal of Plant Diseases and Protection - Coconut is recognized for its popularity in contributing to food and nutritional security. It generates income and helps to improve rural livelihood....  相似文献   

Levels of Arsenic and Antimony in Water and Sediment from Prestea, A Gold Mining Town in Ghana and its Environs     

Y. Serfor-Armah  B. J. B. Nyarko  S. B. Dampare  D. Adomako 《Water, air, and soil pollution》2006,175(1-4):181-192

Arsenic and antimony concentrations in water and sediment samples collected from Prestea, a gold mining town in the Western Region of Ghana and its environs were studied. The concentrations of these elements were measured using instrumental neutron activation analysis (INAA). INAA was preferred to other modern analytical techniques because of its relatively higher selectivity, sensitivity and high precision. Beside its multi-elemental nature, INAA is very fast and thus presents a very good analytical tool for the determination of elemental concentrations in various samples including water and sediment. The samples were irradiated using a 30 kW tank-in-pool Ghana Research Reactor-1 (GHARR-1) operating at a thermal neutron flux of 5 × 10¹¹ n s^?1 cm^?2. The samples were irradiated and counted without any chemical treatment. Elevated levels of As and Sb were found in both water and sediment. Generally, As and Sb concentrations in the water samples ranged from 0.90–8.25 ppm and 0.09–0.75 ppm respectively. These values far exceed the WHO recommended values for As and Sb in water, 0.01 ppm and 0.005 ppm respectively. The levels of As in sediment ranged from 942–10,200 ppm, and that of Sb was 8.5–90.4 ppm. Arsenic concentrations in both water and sediment were generally higher than Sb concentrations. This is, however, not surprising as arsenopyrites (FeAsS₂) are among the major pathfinder minerals associated with gold mined from Ghana. Our results show that the study area is polluted as far as the levels of As and Sb in water and sediment are concerned.  相似文献   

Seasonal Trend of Potentially Toxic Trace Elements in Soils Supporting Medicinal Plants in the Eastern Region of Ghana     

S. B. Dampare  Y. Ameyaw  D. K. Adotey  S. Osae  Y. Serfor-Armah  B. J. B. Nyarko  D. Adomako 《Water, air, and soil pollution》2006,169(1-4):185-206

Investigation was conducted into the occurrence and extent of potentially toxic heavy metals and/or trace elements in soils from three study areas in the Eastern Region of Ghana namely Abonse, Pepease and Mamfe. A protocol for soil sampling, preparation and analysis was developed to yield sufficient information on elemental concentrations in the soils. The soil samples were analysed for As, Co, Cr, Cu, Sb, Th, U, V and Zn, using Instrumental Neutron Activation Analysis (INAA) coupled with conventional counting system. Concentrations of Co, Cr, Th and Zn positively correlate with As, and regressions performed on Co-Zn, Co-Cr, Co-Th, Cr-Th and Zn-Cr values also show strong correlations. The regressions suggest that these elements are geochemically associated and might be enriched simultaneously. Though there are relatively high concentrations of Cu (maximum; 46.3 mg/kg), Co (maximum; 9.17 mg/kg), Th (maximum; 15.1 mg/kg) and U (maximum; 2.38 mg/kg) in some of the soils compared with their levels in world average soils, the average concentrations of the trace elements in general are below or within levels in world average soils/uncontaminated soils. Also, the enrichment index computed in the soils indicates that all the study areas are not enriched with toxic elements, particularly As, Cu, Sb and Zn, and the enrichment index values decrease in the order of Pepease > Mamfe > Abonse. When the average composition of the soils was normalized to the average composition of the underlying rocks, the soils were depleted in the trace elements determined, indicative of background concentration values. Lack of correlations between soil characteristics such as texture, organic carbon, organic matter, total nitrogen and available phosphorous, and most of the trace elements suggests that the influence of these parameters on the distribution of the trace elements is not important in the surface soils.  相似文献