Determination of low-level mercury by cold vapor generation and atomic absorption spectroscopy Page: 17 of 27
This report is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided to UNT Digital Library by the UNT Libraries Government Documents Department.
Extracted Text
The following text was automatically extracted from the image on this page using optical character recognition software:
UNCLASSIFIED ARH-LD-160
13
RESULTS & DISCUSSION (Contd)
Volume of Reductant:
Solutions of . 75 ug Hg in 50 ml of 5% HNO3 were prepared to run through the
procedure. The stir time, stir rate, and flow rate were kept at their
predetermined levels. The solutions are then put through the procedure
using differing volumes of the SnC12 solution. Volumes of 50, 100, 200,
300, 400, 800, 900, and 1500 u1 were used. The 50 and 100p 1 reductant
volumes show low results, probably due to incomplete reduction of the
mercury in the sample. The other volumes through the 600 ul volume show
identical peak heights (1 .015 units). The 1500 ul volume showed a slight
decrease in'peak height (See Figure 7).
Concentration and Amount of Acid:
The effects of different concentrations of acid were found accidently. The
results of the previous section were the clue. Next, while measuring
aliquots of stock solutions to make up ten standards, extra nitric acid
was introduced into one sample standard. These particular standards were
diluted with water and ran through the procedure. The solution with the
extra acid gave a lower peak than the others. A study was done to find
the concentration at which the solutions would record a maximum absorbance.
The result is a curve (See Figure 8) which shows the optimum acid concen-
tration to be approximately 1% for the diluent.UNCLASSIFIED
Upcoming Pages
Here’s what’s next.
Search Inside
This report can be searched. Note: Results may vary based on the legibility of text within the document.
Tools / Downloads
Get a copy of this page or view the extracted text.
Citing and Sharing
Basic information for referencing this web page. We also provide extended guidance on usage rights, references, copying or embedding.
Reference the current page of this Report.
King, A.D. Determination of low-level mercury by cold vapor generation and atomic absorption spectroscopy, report, June 1, 1977; United States. (https://digital.library.unt.edu/ark:/67531/metadc1059904/m1/17/: accessed April 24, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.