Technique

System

 PF

 Detection

 limit

 Ref.

Slotted tube atom trap

-

-

 30 µg/L

 [50]

CPE

1-(2-Thenoyl)-3,3,3-trifluoraceton/ Triton X-114

96

 0.4 µg/L

 [51]

SPE

Amberlite XAD-4 functionalized with 3,4-dihydroxybenzoic acid

91

 0.1 µg/L

 [52]

Precipitation

2-[2`-(6-methylbenzothiazolylazo)] -4-aminophenol

40

 0.5 µg/L

 [53]

SPE

Silica-coated magnetic nanoparticles (SCMNPs) modified with γ-

mercaptopropyltrimethoxysilane

476

 0.092

 µg/L

 [54]

CPE

4-(Phenyl diazenyl)benzene-1,3-

diamine/Triton X-114

30

 0.6 µg/L

 [55]

CPE

2-(2_-Benzothiazolylazo)-5-(N,N

diethyl)aminophenol/Triton X-114

29

 0.1 µg/g

 [56]

CPE

triammonium salt of aurintricarbox- xylic acid

 2.2 ng/L

 This work