Contamination of Potentially Trace Metals in Aqaba and Eshidiya Phosphogypsum in Jordan

Contamination of As, Cd, Cr, Cu, Hg, Pb, Se, Zn and V in Jordan phosphogypsum by product has been determined. The aim of this study is to assess the potential of trace metals contamination caused by production plant of Aqaba and Eshidiya. Arsenic, Cr, Hg, Pb, Se and V have exhibited normal abundances where Cd and U had the highest enrichment factors of 16 and 4, respectively in Aqaba phosphogypsum and 18 and 1, respectively in Eshidiya phosphogypsum. In addition, the elements geo-accumulation index factor were calculated and found that As, Cd, Cr, Cu, Hg, Pb, Se, Zn V are unpolluted to moderately polluted, with the exception of Cd, it shows highly polluted. Arsenic, Cd, Cr, Cu and Zn show immobility to low mobility, whereas Se exhibits intermediate to high mobility. The results obtained in this study can be not worrying from the point of view of environmental safe use of phosphogypsum

Heavy Metal Contamination and Health Risk Assessment in Waste Mine Water Dewatering Using Phosphate (oral132s1) Beneficication Processes

The main objective of study was to determine the degree of heavy metal contamination in Washing Mine Water of phosphate bed-A1 (WMW-A1) and Flotation Mine Water of phosphate bed-A3 (FMW-A3), and to assess the possible health risks associated with oral daily intake and dermal absorption skin of mine water effluents from phosphate mining process. Results showed that the average concentrations of Cd, Cr, Li, Mn, Mo, Ni, Pb, U, Tl, V, and Zn were below the required standard. The contamination index indicated that both mine waters showed slightly low contamination at mine sites, this indicates low raw phosphate inputs from phosphate mining activities. The mean concentrations of Mn and Cr were higher in mine water compared to stream water surface water, waste water, and industrial water. Multivariate statistical analyses including factor analysis and cluster analysis results revealed that natural input from phosphate raw materials was the main source of mine water contamination. The health risk assessment showed that hazard quotient (HQ) and Hazard index (HI) values were \u3c1, indicating non-carcinogenic risk through daily intake and dermal exposure pathway in mine water. The daily intake (DDI) were V\u3eCr\u3eNi\u3e Zn\u3e U\u3eMn\u3eCd\u3ePb\u3eTl in WMW-A1, respectively, and Mn\u3eCd\u3eV\u3eNi\u3eZn\u3eCr\u3eU\u3eTl\u3ePb in FMW-A3, respectively. The Carcinogenic risk for Pb was lower than the acceptable risk of 1:10,000 for regulatory purposes. In long term use, the results showed that the mine water of the Phosphate beneficiation waste processing in Eshidiya mine is contaminated with heavy metals that might affect human health as well as the health of the ecosystem

Selectivity assessments of a sequential extraction procedure for potential trace metals' mobility and bioavailability in phosphate rocks from Jordan phosphate mines

A modified six-step sequential extraction procedure was used to fractionate and determine the following trace metals: U4+, As5+, Cd2+, Cr+2, Cu2+, Ni2+, Pb2+, Zn2+, and V5+ in three different phosphate rocks from mines in Jordan. The mean values of uranium in the samples investigated were 98 ± 6 mgkg-1, 92 ± 3 mgkg-1, 215 ± 6 mgkg-1, and 159 ± 13 mgkg-1, respectively. The sequential extraction results obtained showed that most of the U4+ in these samples was strongly bound with 87%, 93%, 97%, and 93% of the total content, respectively, remaining in the samples after the sequential extraction steps were performed. Hence, 13%-7% and 3%-7%, respectively, of the U4+ is distributed in the most labile form, indicating that the majority of the U4+ in these samples was highly incorporated within the apatite present in the samples. The aforementioned was in agreement with the XRD and SEM-EDX results obtained. The apparent mobility of U4+, As5+, Cd2+, Cr+2, Cu2+, Ni2+, Pb2+, Zn2+, and V5+ (using all six extraction steps) from the Al-Abied and Al-Hasa samples was as follows: As5+ (30.17%)> Cu2+ (6.55%)> Zn2+(4.34%)> Cd2+ (3.84%) Cr+2 (3.66%)> Pb2+ (2.57%)> V5+ (53%)> Ni2+ (1.71%)> U4+ (0.99%). The mobility of As5+, Cd2+, Cu2+, Cr+2, Ni2+, Pb2+, U4+, Zn2+, and V5+ (using all six extraction steps) from Eshidiya samples was as follows: As5+ (17.32%)> Cr+2 (4.84%)> Zn2+ (4.25%)> Pb2+ (4.19%)> Cu2+ (3.49%)> V5+ (1.42%)> Cd2+ (0.78) U4+ (0.09%)> Ni2+ (0%)