We intend to analyze Hg levels in seawater samples. According to the literature, Hg concentrations in water samples may be lower than in sediment. As a result, we will be able to obtain more accurate results if we can concentrate the water samples prior to analysis.
Yes, you use thermal process: either boil it over 100 deg C in normal preasure or freeze it below - 2 - 4 deg C. The concentrate remains more in liquid state, clear water vaporize or gell faster.
Not a device but a method as Dan explained.
An alterative method is to transfer a known volume of water sample to a ground glass stoppered flask (or other suitable closed container.) Digest the sample with dilute potassium permanganate/potassium persulfate solution, and oxidize for two hours at 95°C. The mercury in the digested water sample can then be reduced using stannous chloride, which converts it into elemental mercury. Analysis can then be undertaken using conventional cold vapour atomic absorption.
Information about other methods are available on the internet.
eg http://www.biology.ualberta.ca/facilities/mercury/index.php?Page=1497
Not available but AA spectrometry enables fast and accurate analysis of samples with detection limits below 0.07 ppb (μg/L).
Check out SpeedVac vacuum concentrators, which concentrate liquid in a vacuum environment. Here is the link to the product: https://www.thermofisher.com/us/en/home/life-science/lab-equipment/speedvac-vacuum-concentrators.html?cid=lpd_wlp_eld_r02_co_cp1462_pjt7511_lpd00000_0se_gaw_rs_awa_spdvac-rsae1&ef_id=Cj0KCQjw4PKTBhD8ARIsAHChzRIRP3LbCUUT80seIJYbm5WGgmzDoRTGHTjTWifcL_ihLFc3gINbgFYaAoxnEALw_wcB:G:s&s_kwcid=AL!3652!3!487666989808!e!!g!!speedvac%20eppendorf&gclid=Cj0KCQjw4PKTBhD8ARIsAHChzRIRP3LbCUUT80seIJYbm5WGgmzDoRTGHTjTWifcL_ihLFc3gINbgFYaAoxnEALw_wcB
https://www.researchgate.net/deref/http%3A%2F%2Fwww.biology.ualberta.ca%2Ffacilities%2Fmercury%2Findex.php%3FPage%3D1497
The above methods are applicable and can be helpful.
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