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Table 4 External and internal calibration data for 18 target organochlorine pesticides

From: Limit of detection and limit of quantification development procedures for organochlorine pesticides analysis in water and sediment matrices

Component Linear range (μg/L) External calibration*   Internal calibration**
  Equation Slope R2 Equation Slope R2
α–HCH 1.95-62.5 Y = 13.7X-2.04 13.74 0.9996 Y = 1.8X + 0.71 1.84 0.9994
γ–HCH 1.95-62.5 Y = 4.6X + 6.01 4.6327 0.9990 Y = 0.6X + 1.20 0.62 0.9987
β–HCH 1.95-62.5 Y = 12.9X-2.72 12.90 0.9996 Y = 1.7X + 0.53 1.73 0.9998
δ–HCH 1.95-62.5 Y = 13.1X-7.36 13.15 0.9989 Y = 1.8X-0.09 1.76 0.9982
4,4'-DDE 1.95-62.5 Y = 10.1X + 10.21 10.03 0.9988 Y = 1.3X + 2.21 1.34 0.9991
4,4'-DDD 1.95-62.5 Y = 8.6X + 10.91 8.67 0.9988 Y = 1.2X + 2.22 1.16 0.9988
4,4'-DDT 1.95-62.5 Y = 7.2X + 9.99 7.21 0.9987 Y = 1.0X + 1.98 0.97 0.9984
Heptachlor 1.95-62.5 Y = 12.4X + 6.26 12.36 0.9999 Y = 1.6X + 1.83 1.65 0.9995
Heptachlor epoxide 1.95-62.5 Y = 10.6X + 14.67 10.66 0.9993 Y = 1.4X + 2.92 1.42 0.9988
Endosulfan I 1.95-62.5 Y = 10.0X + 16.38 10.05 0.9980 Y = 1.3X + 3.11 1.34 0.9980
Endosulfan II 1.95-62.5 Y = 6.3X + 8.96 6.34 0.9989 Y = 0.8X + 1.75 0.85 0.9995
Endosulfan sulfate 1.95-62.5 Y = 7.5X- 4.44 7.45 0.9990 Y = 1.0X-0.14 1.00 0.9999
Aldrin 1.95-62.5 Y = 11.2X + 9.37 11.22 0.9995 Y = 1.5X + 2.18 1.50 0.9993
Dieldrin 1.95-62.5 Y = 9.2X + 11.67 9.19 0.9986 Y = 1.2X + 2.37 1.22 0.9989
Endrin 1.95-62.5 Y = 8.3X + 3.35 8.30 0.9997 Y = 1.1X + 1.10 1.11 0.9996
Endrin aldehyde 1.95-62.5 Y = 7.6X + 2.88 7.61 0.9992 Y = 1.0X + 0.97 1.02 0.9998
Methoxychlor 1.95-62.5 Y = 8.8X + 11.11 8.87 0.9984 Y = 1.2X + 2.26 1.18 0.9988
Endrin ketone 7.81-62.5 Y = 3.1X + 3.51 3.13 0.9992 Y = 0.4X + 0.78 0.42 0.9998
  1. *Y = Standard Area, C = standard Concentration ** Y = standard Area × internal standard concentration/internal standard area, C = Standard Concentration.