241
Photoinduced Generation of Hydroxyl Radical in Natural Waters
Table 4 The quantum yield of HO
• (Φ
HO ) of nitrite photolysis as a function of pH and temperature (T)
T (K)
pH
4
5
6
7
8
9
10
11
For wavelength
308 nm
278
0.047
± 0.004 0.037
± 0.002 0.039
± 0.005 0.040
± 0.005 0.040
± 0.002 0.039
± 0.001 0.034
± 0.002 0.030
± 0.003
298
0.091
± 0.011 0.080
± 0.007 0.068
± 0.004 0.068
± 0.009 0.071
± 0.009 0.068
± 0.008 0.060
± 0.007 0.046
± 0.006
318
0.100
± 0.011 0.085
± 0.005 0.081
± 0.006 0.082
± 0.011 0.079
± 0.003 0.080
± 0.003 0.076
± 0.003 0.069
± 0.005
353
0.160
± 0.011 0.159
± 0.008 0.148
± 0.006 0.141
± 0.007 0.143
± 0.003 0.132
± 0.005 0.125
± 0.003 0.115
± 0.004
For wavelength
351 nm
278
nd
nd
nd
nd
0.027
± 0.003 nd
nd
nd
288
nd
nd
nd
nd
0.038
± 0.004 nd
nd
nd
298
nd
nd
nd
nd
0.046
± 0.003 nd
nd
nd
308
nd
nd
nd
nd
0.058
± 0.002 nd
nd
nd
318
nd
nd
nd
nd
0.078
± 0.003 nd
nd
nd
328
nd
nd
nd
nd
0.091
± 0.010 nd
nd
nd
338
nd
nd
nd
nd
0.096
± 0.003 nd
nd
nd
348
nd
nd
nd
nd
0.118
± 0.008 nd
nd
nd
358
nd
nd
nd
nd
0.153
± 0.009 nd
nd
nd
nd
means ‘not detected’
Data source
Zellner et al. (1990)