To: Dr. C.A. Horton,
Head of Analytical Chemistry Division,
Oak Ridge National Laboratory
Tennessee, USA

Forward to:
384 East Dr.
Oak Ridge

From: Dr. S.C. Pande,
Chemist,
Ore Dressing Division,
Indian Bureau of Mines,
NAGPUR. (Maharashtra)
INDIA

Dt. 19thJune, 1976

Dear Dr.

I have gone through two of your very good reviews on the trends in the determination of Fluorine and through your original papers on fluorine determination.

I am also engaged in the determination of fluorine in Fluorspar samples and its beneficiation products done in our laboratory.

I have to confine myself to the Willard-Winter techniques of defluorination and determination by using Thorium nitrate as titrant and Alizarin red-S as an indicator at pH 3.1. I cannot take up the Spectrophotometric methods becaue of the high percentage of CaF2 required to be analysed in the concentrates.

I am in constant touch with Prof. T.S. West (Imp. College of Science & Technology, London); rather I had visited him once in theyear 1974 and he had suggested me the indicator.

Of course, I am fully aware of the neutron activation and ion-selective electrode techniques (rather I used them in Czechloslovakia - UNESCO training programme), in the year 1973-74 with Dr. Weiss) but because of the lack of facilities here in India it cannot be introduced in my laboratory.

I am compiling the work on fluorine determination and without your cooperation it would always remain as an incomplete task. Would you be kind enough to make me abreast with recent developments in the determination of fluorine in all the products (particularly from your laboratory). I shall always remain grateful to you for this help.

I am looking forward for the reprints of your work & suggestions in making this compilation complete and uptodate.

Soliciting your kind cooperation at your earliest as the manuscript is to be ready by August end or September 1976.

With Love,

Sincerely yours,

(Dr.S.C.PANDE)