Table 2 The analytical parameters of reported methods for determination of TU
No | Method | Linear range (μg mL −1 ) | Detection limit (μg mL −1 ) | Ref |
|---|---|---|---|---|
1 | Gas–liquid chromatography | NR | 0.08 | Toyoda et al. 1979 |
2 | Kinetic catalytic spectrophotometry | 0.03-10 | 0.02 | Abbasi et al. 2009 |
3 | Kinetic catalytic spectrophotometry | 0.01-12 | 0.008 | Abbasi et al. 2010 |
4 | Tandem Mass Spectrometry | 0.01-5.0 | 0.001 | Raffaelli et al. 1997 |
5 | Kinetic induction base spectrophotometry | 0.10 – 6.0 | 0.02 | This work |