Spectrophotometric Determination of Iron(II) and Cobalt(II) by Direct, Derivative, and Simultaneous Methods Using 2-Hydroxy-1-Naphthaldehyde-p-Hydroxybenzoichydrazone : Table 8

Table 8: Determination of cobalt in surface soil samples.


Sample and source		Cobalt (μg mL⁻¹)
		Present method*	Reference method [23]

S1	Agricultural land (red soil Anantapur.)
S2	Agricultural land (black soil, Tadipatri.)
S3	Riverbed soil (Tungabhadra river, Kurnool)
S4	Industrial soil (electroplating industry, Anantapur)

*Average of four determinations.