LIMIT TEST FOR ARSENIC.pptx

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 HgCl 2 + 2AsH 3 Hg(AsH 2 ) 2 + 2HCl As H 3 AsO 3 Zn + HCl (Nascent Hydrogen) AsH 3 Mercuric chloride Hg(AsH 2 ) 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”