Chemistry Reference
In-Depth Information
WW AA
<0.2
131
<0.02
1.00
0.98
98 Cr
WW AB
<0.2
74
<0.02
1.00
<0.02
<2 Co
WW AB
<0.2
74
<0.02
1.00
1.00
100 Cu
WW AC
<0.03
120
<0.02
2.00
1.84
92 Fe+Ni
WW AD
1.0
41
0.02
2.00
2.02
100 Fe+Ni
WW AE
5.0
11
<0.02
1.00
1.01
101 Fe
WW AF
10
100
0.04
1.04
0.96
96 Ni
WW AF
10
100
0.04
1.04
0.96
96 Ni
WW AG
19
55
<0.02
0.40
0.37
93 Fe
WW AG
19
55
<0.02
0.40
0.36
90 Fe
WW AG
19
55
<0.02
0.40
0.37
93 Fe
WW AG
19
55
<0.02
0.40
0.38
95 Fe
WW AG
19
55
<0.02
0.40
0.36
90 Fe
a
DIW=deionised water; WW=waste water
b
10 mg L
−1
sulphide also added
c
Added as Fe(CN)
4
3−
, Ni(CN)
4
2−
, Cu(CN)
4
3−
, Cr(CN)
4
3−
and Co(CN)
4
3−
Source: Reproduced with permission from the American Chemical Society [54]
Table 8.18 presents typical results for wastewater samples containing thiocyanate. The
values clearly indicate that the thiocyanate interference encountered in high-acidity
procedure is avoided with the EDTA displacement procedure.
Table 8.19
Total cyanide values by photometric and ISE-potentiometric finishes for
samples treated by EDTA displacement procedure (values expressed in terms
of original samples taken for distillation)
Total cyanide found,
mg L
−1
by photometry
Nature of sample distilled
a
by ISE-potentiometry
DIW
0.07
0.07
DIW
0.40
0.50
DIW
0.50
0.43
DIW
0.70
0.80
DIW
0.95
0.80
DIW
1.01
1.02
DIW
1.08
1.20
Search WWH ::
Custom Search