Silica-titania xerogel doped with Mo,P-heteropoly compounds for solid phase spectrophotometric determination of ascorbic acid in fruit juices, pharmaceuticals, and synthetic urine

Table 7 Comparison of the analytical ranges of various spectrophotometric methods of AA determination

Method	Reagent or sensor material	Linear range, mg/L	Reference
Spectrophotometry	2,6-Dichloroindophenol	1–20	[7]
	p-Aminobenzoic acid	20–67	[8]
	Diazotized 1-aminoanthraquinone	5–25	[9]
	Fe(III)- 2,4,6-tripyridyl-s-triazine	2–40	[10]
	Fe(III)-ferrozine	0.2–10	[11]
	Fe(III) 1,10-phenantroline	1–80	[12]
	Cu(II)-neocuproine	1.4–14	[13]
	V,W,P-HPC	1–80	[14]
	V,W,P-HPC	2–24	[15]
	UV absorbance	2.5–30	[16]
Solid phase spectrophotometry	Sephadex QAE A-25, UV absorbance	0.3–5.0	[16]
	Silica xerogel doped with Mo,P-HPC	1–50	[17]
	Bindschedler’s Green immobilized on SiO₂–SO₃H	0.3–5	[27]
	Silica-titania xerogel	6–110	[29]
	Silica-titania xerogel doped with Mo,P-HPC	2–200	Present work

ISSN: 2661-801X