Dispersive Liquid-Liquid Microextraction Based on Solidification of Floating Organic Drop Followed by Gas Chromatography-Electron Capture Detector for Determination of Some Pesticides in Water Samples

Table 2

Determination of endosulfan (EN), Butachlor (BU), and Dichlorvos (DI) in tap, sea, and river waters.

Sample

Concentration of analytes (μg L^−1)

Added of analytes (μg L^−1)

Found analytes (μg L^−1) ± RSD, 𝑛=4

Relative recovery (%)

EN

BU

DI

EN

BU

DI

EN

BU

DI

EN

BU

DI

Tap water^a

n.d.^d

n.d.^d

n.d.^d

0.5

0.5

0.5

0.45 ± 5.6

0.48 ± 3.2

0.44 ± 5.3

90

96

88

Sea water^b

n.d.^d

n.d.^d

n.d.^d

0.5

0.5

0.5

0.43 ± 6.7

0.46 ± 8.4

0.45 ± 4.5

86

92

90

River water^c

n.d.^d

n.d.^d

n.d.^d

0.5

0.5

0.5

0.47 ± 6.3

0.49 ± 7.1

0.44 ± 9.1

94

98

88

^aFrom drinking water system of Tehran, Iran.
^bFrom Caspian sea (Sari, Iran).
^cSyahrood river (Juybar, Iran).
^dNot detected.