Gene/Protein
Disease
Symptom
Drug
Enzyme
Compound
Pivot Concepts:
Gene/Protein
Disease
Symptom
Drug
Enzyme
Compound
Target Concepts:
Gene/Protein
Disease
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Drug
Enzyme
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Query: EC:1.6.5.4 (
SOR
)
720
document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)
In order to study the characteristics and source of water-soluble ions in PM
2.5
in Panjin, PM
2.5
samples were collected at three sites in January of 2017, and the levels of eight ions (Na
+
, Mg
2+
, Ca
2+
, K
+
, NH
4
+
, SO
4
2-
, Cl
-
, and NO
3
-
) were determined by
ICS
-900 ion chromatograph. The characteristics of PM
2.5
, the water-soluble ion concentration,
SOR
and NOR calculation, and ion balance calculation were investigated, and a principal component analysis was conducted. The results showed that the concentration of PM
2.5
and water-soluble ions followed a descending sequence of park > development zone > the second middle school. SO
4
2-
, NO
3
-
, and NH
4
+
were the major components of the water-soluble ions at the three sampling sites.
SOR
and NOR values were all higher than 0.10, indicating that SO
4
2-
and NO
3
-
were mainly converted from SO
2
and NO
x
. The ion balance calculation demonstrated that the cationic and anion equivalents in Panjin had great correlation in winter. Further study showed that the atmosphere in the development zone presented as neutral and that in the cultural park and the second middle school presented as partially alkaline. The principal component analysis further indicated that the water-soluble ions were mainly derived from fuel combustion, biomass burning, secondary particles, and re-suspended dust in winter.
...
PMID:[Characteristics and Source Apportionment of Water-soluble Ions in PM
2.5
During Winter in Panjin]. 2996 6
