Study of the Silicic Acid Procedure of Armour and Burke for the Separation of Polychlorinated Biphenyls from DDT and Its Analogs
- 1 September 1972
- journal article
- research article
- Published by Oxford University Press (OUP) in Journal of AOAC INTERNATIONAL
- Vol. 55 (5) , 1092-1100
- https://doi.org/10.1093/jaoac/55.3.1092
Abstract
The silicic acid procedure of Armour and Burke for the separation of polychlorinated biphenyls from DDT and its analogs produces an adequate separation of Aroclor 1260. However, the procedure cannot completely separate p,p′-DDE from Aroclors 1221, 1232, 1242, and 1254. Factors causing variable column properties were examined. The 7 hr minimum period for silicic acid activation was found to be inadequate for reproducible water-silicic acid preparations. A 24 hr minimum period is suggested. The use of Celite in column preparation often results in improperly prepared columns and should be eliminated. Nonreproducible columns might also be due to a heterogeneous water-silicic acid adsorbent which is a result of an irregular distribution of water molecules on to the silicic acid particles.Keywords
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