In the past Shahid Naseem has collaborated on articles with Kapil Dev Brahman. One of their most recent publications is Evaluation of high levels of fluoride, arsenic species and other physicochemical parameters in underground water of two sub districts of Tharparkar, Pakistan: A multivariate study. Which was published in journal Water Research.

More information about Shahid Naseem research including statistics on their citations can be found on their Copernicus Academic profile page.

Shahid Naseem's Articles: (2)

Evaluation of high levels of fluoride, arsenic species and other physicochemical parameters in underground water of two sub districts of Tharparkar, Pakistan: A multivariate study

AbstractIn present study total arsenic, inorganic arsenic species and fluoride ion contaminations in underground water of Diplo and Chachro sub district of Tharparkar, Pakistan were investigated. The concentrations of total As, inorganic As species, F− and others physicochemical parameters were reported in terms of basic statistical parameters, principal component analysis, cluster analysis, sodium absorption ratio and saturation indices. The As3+ was determined by cloud point extraction using ammonium pyrrolidinedithiocarbamate (APDC) as complexing reagent, and complex was extracted by surfactant-rich phases in the non-ionic surfactant Triton X-114; after centrifugation the surfactant-rich phase was diluted with 0.1 mol/L HNO3 in methanol. While total inorganic arsenic (iAs) was determined by solid phase extraction using titanium dioxide (TiO2) as an adsorbent, after centrifugation, the solid phase was prepared to be slurry for determination. The extracted As species were determined by electrothermal atomic absorption spectrometry. The concentration of As5+ in the water samples was calculated by the difference of the total iAs and As3+, while F− and other anions were determined by ion chromatography. The positive correlation of F− and As species with Na+ and HCO3− showed that the water with high salinity and alkalinity stabilized the As species and F− in the groundwater. The positive correlation (r = 0.640, p = 0.671) was observed between total As and it species with F−. Results showed that underground water samples of these two areas of Tharparkar were severely contaminated with arsenic and fluoride ion, which are exceeded the World Health Organization (WHO) provisional guideline value, and United States Environmental Protection Agency, maximum contaminant level of 0.01 mg/L and 1.5 mg/L, respectively.

Lithological influences on occurrence of high-fluoride groundwater in Nagar Parkar area, Thar Desert, Pakistan

AbstractFactors regulating the occurrence of high fluoride (F−) concentrations in groundwater near Nagar Parkar Town, SE corner of Pakistan have been investigated considering lithological influences. F− ion concentrations in groundwater range up to 7.85 with mean value of 3.33 mg L−1. Plots of major elements and their normative mineral composition reflect granitic composition of the rocks in the study area. Modal mineralogical analysis show high perthite, plagioclase feldspars and quartz, while micas, amphiboles and pyroxenes occur in minor quantities. Water–rock interactions, based on dissolved ions of F−, SiO2, Na+, K+, Mg2+, Li+ and Sr2+ suggest that fluoriferous groundwater originates from granitic rocks, typically from albite, biotite, hornblende and pyroxene and its alteration products such as kaolin and soil. The Log TDS, Na/Na + Ca ratio, Mg/Ca + Mg and Cl/Σ anions are significant to review the impact of weathering processes which promote the availability of F− ions in the groundwater of study area. Principal component analysis (PCA) also renders close association among F− ions and other elements in the rocks and groundwater. Studies on F− estimation in the granite rock, china clay, soil and sand samples also indicate the presence of high F− concentration in these materials and average values have been found to be 1939, 710, 254 and 16 mg kg−1, respectively.

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