[Study on simultaneous determination of nitrate and sulfate in air of residential areas by ion-chromatography].
OBJECTIVE
A method for determination of nitrate (NO3(-)) and sulfate (SO4(2-)) in air of residential areas by ion-chromatography (IC) was established.


METHODS
The anions in aerosol samples collected with filter member were extracted by ultrasonic leaching and separated on IonPac AS11-HC analytical column and IonPac AG11-HC guard column with 20.0 mmol/L potassium hydroxide eluted at 1.00 ml/min, and then detected by DS6 suppressed conductivity detector, with the satisfactory determination of atmospheric nitrate and sulfate.


RESULTS
The correlation coefficient of nitrate and sulfate were greater than 0.9999. The quantification limit of NO3(-) and SO4(2-) was 0.011 microg/m3 and 0.024 microg/m3 respectively. The sampling filter members were divided into four parts equally and spiked, and the recoveries of nitrate and sulfate were 99.6% - 105.6%. The relative standard deviation (RSD) of nitrate and sulfate were less than 3%.


CONCLUSIONS
The method was simple, rapid, reproductive and sensitive for determination of nitrate and sulfate in air of residential areas.
Institute of Environmental Health & Related Products Safety, China CDC, Beijing.
Hongwei
H
Wang
Xi
X
Chen
Shifen
S
Mou
Hongguo
H
Zheng
Dongqun
D
Xu
Shaobin
S
Lin
D000336:Aerosols; D000393:Air Pollutants / Q000032:analysis*; D000838:Anions; D002845:Chromatography; D002852:Chromatography, Ion Exchange; D009566:Nitrates / Q000032:analysis*; D013431:Sulfates / Q000032:analysis*
D000336:Aerosols; D000393:Air Pollutants; D000838:Anions; D009566:Nitrates; D013431:Sulfates