Simultaneous Determination of Copper (II) and Mercury (II) by Using a Zero-Crossing Method

Simultaneous Determination of Pb(II), Cu(II) and Ni(II) with MEDTA by Ultraviolet and Visible Derivative Spectrophotometry

“…Until the principle of electronic differentiation was introduced, this technique was lim obtaining the first derivative, which restricted its applications. O'Haver et al have undertaken an excellent study of the theoretical aspects of this technique and its multiple potential uses [7,8, In the quantitative analysis of mixtures with two or more components by means of derived spectrophotometry, successful use can be made of the zero crossing point method [10,11,12,13,14]. This is based on the fact that, at the wavelength at which the maximu absorption of one component occurs in the zero order spectrum, there is a cancelling out of dA/dλ in the first-order spectrum (first derivative).…”

“…In the quantitative analysis of mixtures with two or more components by means of derived spectrophotometry, successful use can be made of the zero crossing point method [10,11,12,13,14]. This is based on the fact that, at the wavelength at which the maximum absorption of one component occurs in the zeroorder spectrum, there is a cancelling out of dA/dλ order spectrum (first derivative).…”