Interferences of Glasses in
Selenium Determination by Atomic Spectrometry with Hydride Generation
S. Hapuarachchi and
T. G. Chasteen
Department of Chemistry
Sam Houston State University
Huntsville, Texas 77341-2117
The chemical interferences of Hg2+, Sn4+,
Pb2+, As3+, Sb3+, Bi3+ and
Te4+ in determination of selenium have been studied but interferences
from the glassware commonly used in these analyses have not been well understood
in analysis of selenium. When a glass tube, which was used to prepare selenium
samples in the required Se(IV) oxidation state, was used without proper
treatment it caused a large negative interferences in selenium analysis
(10-90%). The aim of this work was to determine the magnitude of interferences
of glassware in the determination of selenium and proper treatment to remove
those interferences. Treatments with chemical acids and commercial detergents
will be discussed.
| SAMPLE |
EXPECTED CON.(ppb) |
TEST CON.(ppb) |
%ERROR |
| TUBE1 |
5.00 |
1.85 |
-62.93 |
| TUBE2 |
5.00 |
2.76 |
-44.8 |
| TUBE3 |
5.00 |
6.06 |
21.27 |
| TUBE4 |
5.00 |
0.51 |
-89.87 |
| TUBE5 |
5.00 |
3.01 |
-39.67 |
| TUBE1 |
10.00 |
3.47 |
-65.27 |
| TUBE2 |
10.00 |
3.17 |
-68.35 |
| TUBE3 |
10.00 |
10.99 |
9.93 |
| TUBE4 |
10.00 |
0.83 |
-91.70 |
| TUBE5 |
10.00 |
9.93 |
-0.70 |
| TUBE1 |
15.00 |
4.54 |
-69.73 |
| TUBE2 |
15.00 |
5.35 |
-64.33 |
| TUBE3 |
15.00 |
15.49 |
3.23 |
| TUBE4 |
15.00 |
2.50 |
-83.16 |
| TUBE5 |
15.00 |
3.64 |
-75.73 |
TUBE1- Untreated glass tube
TUBE2- Treated with distilled water
TUBE3- Treated with nitric acid
TUBE4- Treated with hydrochloric acid
TUBE5- Treated with sulfuric acid