A Novel, Simple, and Reliable Spectrophotometric Determination of Total Hexavalent Chromium by Complexation with a New Reagent of Thiazole Linked to 2H-Chromen-2-One

Table 4

Methods for measuring Cr (VI) in cement using a variety of chromogenic agents: a comparison.

Method	Matrix	Reagent	LOD (mg/kg)	Reference
Spectrophotometric	Cement	Diphenylcarbazide	0.0010	[22]
Spectrophotometric	Cement	Variamine blue	0.0500	[22]
Spectrophotometric	Cement	1, 5-diphenylcarbazide	0.0013	[22]
Spectrophotometric	Cement	Thiazole linked to 2H-chromen-2-one	0.0007	This study