Limit Test for Arsenic

1. LIMIT TEST FOR ARSENIC
Presented By,
Ms. Kiran Ravindra Divekar
Assistant Professor, SCPER, Kopargaon

2. “
Apparatus used for Arsenic limit test

3. “ ‘Gutzeit
Apparatus’

4. PRINCIPLE
HgCl2 + 2AsH3 Hg(AsH2)2 + 2HCl
As H3AsO3
Zn + HCl
(Nascent Hydrogen)
AsH3
Mercuric chloride
Hg(AsH2)2 + 2HCl
(Arsenic) (arsenious acid) (arsine gas) (Mercuric arsenide)
Stannated acid
Stannated acid: HCl + stannus chloride in minimum quantity

5. “
PROCEDURE

6. “
If the stain produced by test is no deeper than
standard stain, then sample complies limit test
for arsenic.
OBSERVATION

7. “
After 40 minutes, if the intensity of the
yellow stain produced in the standard is
more that in the test, the sample complies
with the limit test of lead.
RESULT & CONCLUSION

8. “THANK
YOU”