Table 2.

Fine structural parameters of the fresh and used ZVIN for the treatment of 150, 200, and 250 mg l^-1 nitrite or nitrate solutions analyzed by EXAFS spectra.

	Shell (1st)	CNa	R (Å)b	c
Fresh ZVI nanoparticle
	Fe–Fe	9.66	2.25	0.0239
Nitrite (NO2-) (mg l-1)
150	Fe–O	4.45	1.97	0.0122
200	Fe–O	4.21	1.98	0.0129
250	Fe–O	4.11	2.01	0.0132
Nitrate-(NO3-) (mg l-1)
150	Fe–O	4.45	1.99	0.0117
200	Fe–O	4.71	1.98	0.0124
250	Fe–O	4.88	1.97	0.0147

^aCN: Coordination number.

^bR: Bond distance.

^cσ: Debye-Waller factor.