Potentiometric Determination of Chlorate Impurities in Hypochlorite Solutions

Table 4

The results of the determination of NaClO₃ in the standard solution of 1025 mg/L NaClO with 5 mg/L of NaClO₃ according to the procedure with the reduction of ClO^- excess with 0.085 N Na₂SO₃; V₀ = 10 mL; = 0.5 mL; (N = 5, P = 0.95).

No.	Added Na2SO3, mL	Calculated according to (7) NaClO, mg/L	Reduced NaClO, %	Calculated according to (10) NaClO3, mg/L	, %
1	0	1024±4,7	0	3,7±1,7	52,4
2	2,0	391±4,1	61,8	4,1±1,0	27,8
3	2,5	233±3,6	77,3	4,8±0,3	7,1
4	2,8	138±3,5	86,5	4,9±0,2	4,7
5	3,0	75±3,3	92,7	4,9±0,2	4,7