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01 mg/kg using APCI; however, dilution of the samples minimized this effect. Using APCI, the trueness of the target compounds ranged from 77% to 121% at both spiking levels, except for pyrethrins owing to matrix effects, with relative standard deviations of less than 14%. For most compounds, these results were comparable with those obtained using EI. However, because the use of APCI limited fragmentation, this ionization technique offered significantly higher sensitivity and specificity than EI. Using APCI, linear calibration curves with c
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