A new and sensitive reaction rate method for spectrophotometric determination of trace amounts of thiourea in different water samples based on an induction period

Journal of Analytical Science and Technology

Table 1 Interferences for the determination of TU (0.50 μ g mL ⁻¹ )

Species	Tolerance limit (W _Species /W _TU )
Co⁺², Na⁺, Ca⁺², Al⁺³, K⁺, NO₃ ⁻, S₂O₈ ⁻², Urea , Glucose	1000
Cu⁺²	800
Cd⁺², Zn⁺², Mn⁺², Mg⁺², Fe⁺³	500
Citrate, Acetate, Ba⁺²	300
EDTA, Pb⁺², Oxalate	200
Formate, Salicylate, PO₄ ³⁻	100
CO₃ ²⁻	80
CN⁻	65
Ni⁺²	40
Cl⁻, Tartaric acid	20
Cr₂O₇ ²⁻, Ag⁺	5
Hg⁺²	2