yes, rather “traditional” methods:

electrochemical,

colorimetry and

gravimetry

Find paper

Dear Pallavi,

You can think about the use of TXRF spectrometry (Total-reflection X-Ray Fluorescence) which with a simple deposition of about 10 microliters of water over a sample support reflector, previously standardized with an internal standard, allow the multielemental detection of the present elements from Al to U. In particular Se is a very sensitive element and detections limits in the ppt (ng/L) range can be achieved. Greetings.