Table 7.

Comparison of thallium determination results in different environmental samples with the use of inversion voltammetry techniques (Griepink et al. 1998)

Sample	Electrolyte	Type of electrode used in the voltammetric technique	Electrolysis parameters	Interference	Detection limit [ng∙L−1]
Natural water	pH 4.8; EDTA	HMDE—hanging mercury drop electrode	−0.9 V/SCE	Bi, Cu, Sb	0.5
Natural water	pH 4.5; octane EDTA	MFE—mercury-film electrode	−0.8 V/Ag/AgCl	Cd, Pb, Cu	0.011
Sea water	EDTA	MFE—mercury-film electrode	−1.1 V	Cd, Pb	40
Sea water	pH 3.5; KNO3	MFE—mercury-film electrode	−0.9 V/SCE	Pb, Cu	0.6
Sea water	KNO3/EDTA	MFE—mercury-film electrode	−1.2 V/Ag/AgCl	Cu, Pb, Cd, Zn, Bi, Co, Ni, Sn, Fe	–
Rocks	pH 7–8; citrate EDTA	HMDE—hanging mercury drop electrode	−0.75/SCE	Requires separation	–
Salts	pH 4.5; EDTA	HMDE—hanging mercury drop electrode	−0.6/SCE	Cu, Pb, Cd, Bi, Sb, Sn	200