Acid washed sand

[IanMc]

"Dr Engelbert Buxbaum" <engelbert_buxbaum at hotmail.com> wrote in message 
news:ef0q0q$hsi$03$1 at news.t-online.com...
> keaboletse Moemedi wrote:
>
>>  I do not have a commercial
>> sand but i want investigate the pigment of phytoplankton in surface
>> water. Please advice me how to prepare the sand which is not
>> commercially prepared.
>
> The usual way to do this is to boil sea sand (mostly SiO2) with
> hydrochloric acid to remove acid-soluble contamminants (in particular
> calcium carbonate) and then glow it to destroy organic matter.

What do you mean by glow it? Heat it until it glows?

Ian Mc