Spiked concentration (μM)

Lake sample

Shellfish sample

Detected concentration (μM)

Recovery (%)

Detected concentration (μM)

Recovery (%)

10

9.56 ± 0.51

96

11.62 ± 0.42

116

8

8.30 ± 0.43

104

9.00 ± 0.46

112

6

6.18 ± 0.35

103

6.55 ± 0.27

109

4

4.32 ± 0.38

108

4.49 ± 0.28

112

2

1.86 ± 0.27

93

2.35 ± 0.21

117

1

1.15 ± 0.12

115

0.95 ± 0.10

95

0.5

0.46 ± 0.06

91

0.45 ± 0.07

90