Table 5.

Comparison of gravimetry and UV spectrophotometry.

Actual Concentration (mg/L)	Gravimetry		UV Spectrophotometry
	Testing Concentration (mg/L)	Relative Deviation (%)	Testing Concentration (mg/L)	Relative Deviation (%)
10.00	7.12	26.0	8.97	13.2
	6.57		8.25
	8.51		8.83
50.00	45.12	13.0	49.50	2.2
	41.06		51.91
	44.32		51.90
100.0	88.96	9.3	100.2	0.5
	90.68		100.9
	92.34		100.4