Is there any other method?
In most of the research papers i have found that generally the formula used for calculation of non sea salt fraction, Na measured is used multiplying with the sea ratio for particular ion with Na.
You can used Ca or Al ratio as a crust indicator. It can be non-sea salt ratio.
Magnesium is alos a crustal element so it is not as good as sodium as a teacer for sea-salt.
Also: part of the chloride of seasalt can be sustituted by sulphate and nitrate by a reaction with sulphuric acid and nitric acid. This is known as the Cl-deficit
Thank you very much for your valuable suggestions. I would like to know how can i determine local input of Na to particulate matter?
I like to add that sodium also is present in trace amounts in the exhaust of oil refineries, for which vandium is ofgten the best tracer. The sodium form oil can be discriminated from seasalt-Na becasue in the plume it is present as submicron Na, while in seasalt it is almost completely present in particles larger than 1 micron.
Another source of sodium is road-slat for deicing of Streets. We discriminate such events by combining analysis of the air trajectories and the Na/Mg ratio for source apportionment
I
Thank you Brink sir. By local input I meant sources of Na like re-suspended dust from river bed, soil dust etc. In our case we found Na/Mg ratio larger than sea water ratio and i am following the ratio given in this article 'Ionic composition of PM10 in the area of Thessaloniki, Greece'.
Yes chemical fractionation or enrichment is usually taken against Na for sea salt aerosols. But size segregation is essential to ensure that the Na-source is inorganic sea salt (super-micron) particles as per Prof. ten Brink's advise.
Recent inputs from the ocean atmosphere facility at Scripp's institute of oceanography also suggest fractionation into submicron sea salt aerosols comprising Mg-rich+organic. Field campaigns like JASE-traverse and some single particle studies report Mg-rich + organic Sea salt aerosols (mostly sub-micron).
U can separate water soluble and insoluble Na compounds to distinguish sea salt and crustal origin
Shamsh
Could you provide info on the mineral that is the origin of the non-soluble sodium?
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