Chemistry Reference
In-Depth Information
Fig. 3.14
Absorption spectra in the organic phase (curve 1) reagent blank
(reference, extracting solvent); (curve 2) phosphorus, 0.428µg
(reference, extracting solvent); aqueous phase, 12ml, organic phase
5ml
Source: Reproduced with permission from Elsevier Science [172]
Table 3.11
Effect of volume of sample solution
Sample
solution
taken (ml)
Sulphuric
acid added
(ml)
Reagent
solution
added (ml)
Absorbance of
reagent blank
Absorbance
units for
µg L
−1
phosphorus
Molar
absorptivity*
(105L mol
−1
cm
−1
)
5
0.5
0.5
0.034
0.007
2.30
10
1.0
1.0
0.044
0.015
2.26
25
2.5
2.5
0.062
0.038
2.31
50
5.0
5.0
0.078
0.080
2.48
100†
10.0
10.0
0.122
0.124
2.69
Search WWH ::
Custom Search