Evaluation of modifications to the alca standard method for tannin analysis in tannery liquors

The American Leather Chemists Association (ALCA) Standard Method for tannin analysis was developed to provide tanners with a way to monitor the relative strength of tan liquors in their process. Although it took full advantage of existing technology in the early 1900's, that method is very restrictive, laborious and time consuming. Advances in filtering technology allow modern researchers to process materials much more efficiently than in the past. Several filtration methodologies were incorporated into existing ALCA methods, and modifications were evaluated for time efficiency, effectiveness, and comparability to the Standard Methods. Direct determination of solids on undiluted tan liquor was evaluated against the Standard Method procedures.