Vertical Geochemical Variations and Speciation Studies of As, Fe, Mn Zn, and Cu in the Sediments of the Central Gangetic Basin: Sequential Extraction and Statistical Approach.

The same trend was also observed for carbonate with Fe (r 2 = 0.88), Mn (r 2 = 0.88), Zn (r 2 = 0.72) and Cu (r 2 = 0.86), and a moderately negative correlation with As (r 2 = −0.55; p < 0.05) in the core of Chaube Chhapra but it showed a positive correlation with Zn (r 2 = 0.75) and a moderately significant with Mn (r 2 = 0.44; p < 0.05) only.

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