This study investigates the role of age of first exposure in the acquisition and processing of English articles in an EFL setting. Fifty advanced Korean learners of English participated in a grammatical acceptability judgment task and a self-paced reading task. The participants were divided into two groups depending on the initial age at which they were constantly exposed to English at least 3 hours per week (‘early group’ < 12; ‘late group’ ≥ 12). No significant performance differences were observed between the two groups in the judgment task. However, meaningful differences were found between the reading behaviors of the two groups in the self-paced reading task. These findings show that the learners’ age of first exposure has a significant impact on learners’ performance when the ability to process English articles in real-time is evaluated. In contrast, it has much less impact on learners’ performance on a task which tests explicit knowledge under no time-limit condition.

The analytical method for 16 organophosphorus pesticides was developed in this study. The 16 organophosphorus pesticides were analyzed by liquid chromatography-tandem mass spectrometry (LC/MS/MS) using on-line solid phase extraction (on-line SPE) with PLRP- S cartridge. Analysis of all analytes in the MS/MS was processed in the electrospray ioni-zation (ESI) positive mode. They are Azinphos ethyl, Chlorfenvinphos, Ethion, Famphur, Phosmet, Phosphamidon, Terbufos, Aspon, Chlorpyrifos-methyl, Crotoxyphos, Dichlofenthi-on, Dicrotophos, Fonofos, Thionazin, Dimethoate and Iprobenfos. Limits of detection (LODs) and Limits of quantification(LOQs) were obtained as 0.8~2.0 ng/L and 2.6~6.4 ng/L, respectively. All compounds were not detected at the 8 sampling points of the raw water and clean water.