科研之友
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摘要
The present study proposes an analytical methodology that employs ion chromatography-conductivity detection for simultaneous quantification of inorganic (F-, Cl-, NO3-, SO42-, and PO3-), monocarboxylate (HCOO-,CH3COO-, propionate, n-butyrate, lactate, and pyruvate), dicarboxylate (oxalate and succinate), and tricarboxylate anions (citrate), as well as crustal cations (Li+, Na+, K+, NH4+, Ca2+, Mg2+) at low pg m(-3) range in airborne particle samples in one single run. The optimized conditions for anions were as follows: 0.6 mmol L-1 KOH for 0-14 min, 0.6-15 mmol L-1 KOH 14-20 min, 15-38 mmol L-1 KOH during 20-32 min and finally returned to 0.6 mmol L-1 for a period of 3 min, thereafter the eluent flow rate was 0.38 mL min(-1). Similarly, for cations, isocratic elution was adjusted to 0.36 mL min(-1) at 17.5 mmol L-1 H2SO4. LOD ranged 3.0-130 pg m(-3) and LOQ was within 10-400 pg m(-3) (Li+ and PO43-, respectively) as well as recoveries ranged 89% (Ca2+) to 120% (Li+). Major ions were successfully determined in real PM1 and PM2.5 samples. The method used here was found to be a comprehensive, simple, cheap and reliable procedure for studying ions in particulate matter (PM) samples even those from remote areas or near ecosystem natural conditions.
- 出版日期2012-11-30
