Dear Sir. Concerning your issue about the strontium detection procedure by spectrophotometer. strontium can be determined spectrophotometrically wtih use xylenol orange as a chromogenic reagent.And also other methods are available. I think the following below links may help you in your analysis:

 http://jcsp.org.pk/ArticleUpload/1939-8638-1-RV.pdf

http://journals.tubitak.gov.tr/chem/issues/kim-05-29-6/kim-29-6-11-0411-11.pdf

https://www.chempap.org/file_access.php?file=2310a721.pdf

Thanks

Dear Jameer,

In the following paper, it is established a simple, rapid and sensitive method for the determination of strontium by spectrophotometry.

http://www.asianjournalofchemistry.co.in/User/ViewFreeArticle.aspx?ArticleID=25_1_119

 See also :

The spectrophotometric determination of strontium with murexide (ammonium purpurate), by D.S. Russell, J.H. Campbell and S.S. Bermaban

Analytica Chimica Acta, Vol. 25, Issue 1, 1961

With my best regards

Prof. Bachir ACHOUR

Dear Jameer,

you can follow AOAC method : https://www.agilent.com/cs/library/usermanuals/Public/0009.pdf

Good Luck!

Dear Jameer

You can follow the above links suggested by my colleagues and prof.

Or you can also have a look on this paper:

http://www.sciencedirect.com/science/article/pii/S0003267001815208

Regards