CONTENTS PAGE I. Introductory 147 II. Materials and methods ..148 III. The swelling of gelatin in water, hydrochloric acid and caustic soda . .148 IV. The state of gelatin dissolved by acid or alkali in the cold 153 V. The basic and acidic properties of gelatin . .155 VI. The behaviour of swollen gels in an atmosphere of saturated water vapour . .156 VII. Theory of gel structure deduced from a ...

To eliminate hazardous hexavalent chromium from a brass wire-mill waste, hydrogen peroxide was examined In place of chromic acid for pickling, first in bench-scale tests and then in plant tests. Nthough the elimination of chromic acid requires more rigid control of the ~ wastewater treatment operation and increases the zinc content of the waste-treatment effluent, the economic benefit of substi...