Ultratrace Determination of Cr(VI) and Pb(II) by Microsample Injection System Flame Atomic Spectroscopy in Drinking Water and Treated and Untreated Industrial Effluents

Table 1

Tolerable levels of concomitant ions for the extraction of 10 µg/L Cr(VI) and Pb(II) (𝑁=4).

Ions	Tolerable levels (mg/L)
	Cr(VI)	Pb(II)
Na^+, Cl^−	1,000
Li^+, K^+, Ca^2+, Mg^2+	250
SO4^−2, NO3^−	100
Cu(II), Fe(II), Se(II), As(III), Co(II), Hg(II), Mn(II), Cr(III), Ni(II), Al(III), Zn(II)	50