Alternatively, crystals were formed on the precipitated sludge by adding 135 g.L NaOH dosages producing a white layer in the bottom of the flasks, indicating that the amount of caustic soda was higher than that theoretically required to form the insoluble chromium hydroxides.
Por otro lado, con dosis de NaOH de 135 g.Lse formaron cristales sobre el lodo precipitado y una capa blanca en el fondo de los recipientes, indicando que la cantidad de soda cáustica usada era superior a la necesaria teóricamente para formar los hidróxidos de cromo insolubles.