June 06, 2020, 05:02:27 AM
Forum Rules: Read This Before Posting


Topic: assay/purity  (Read 22324 times)

0 Members and 1 Guest are viewing this topic.

asqa

  • Guest
assay/purity
« on: June 24, 2005, 07:18:50 AM »
differentiate the assay value and purity value.?Compound having 100% purity but assay is 90% only.comment

kerryh

  • Guest
Re:assay/purity
« Reply #1 on: June 24, 2005, 09:05:54 AM »
"Pure" denotes an undenatured product or a product with a single component as opposed to a mixture. "Purity" refers to the assay or percent composition of the chemical. For example, 190-Proof pure Ethanol has an assay (Purity) of 95% Ethanol and 5% water. This distinction is very important when discussing the critical levels of contaminants and other specifications of chemical products. When referring to the "purity" of a product, it is better to use the term '"assay."


Hope this helps.

piyush

  • Guest
Re:assay/purity
« Reply #2 on: July 08, 2005, 04:13:46 AM »
dear,
purity means the assay on anhydrous basis where as the assay of the compound is the assay on as is basis.

i hope that this will help.

asqa

  • Guest
Re:assay/purity
« Reply #3 on: July 20, 2005, 08:07:11 AM »
is it? shall we write purity instead of assay on anhydrous basis.

why then two different terminology?

Offline Dude

  • Chemist
  • Full Member
  • *
  • Posts: 237
  • Mole Snacks: +42/-9
  • I'm a mole!
Re:assay/purity
« Reply #4 on: July 20, 2005, 05:31:59 PM »
In the Analytical Chemistry book that I have, an assay is "the process of determining how much of a given sample is the material indicated by the analyte's name."  Therefore, as an example, the toluene sample was assayed for purity by gas chromatography and the purity was determined to be 99 %.  

asqa

  • Guest
Re:assay/purity
« Reply #5 on: July 20, 2005, 11:52:52 PM »
as per definition it is OK but your example was confusing.

for example i adding 2% w/w water to toluene then i am analysing in GC what the answer i will get 100% assay or 100% purity tell me friend

Offline Dude

  • Chemist
  • Full Member
  • *
  • Posts: 237
  • Mole Snacks: +42/-9
  • I'm a mole!
Re:assay/purity
« Reply #6 on: July 21, 2005, 07:58:54 AM »
100 % purity.   Assay is the process or technique (in this example gas chromatography).  

Sponsored Links