A new procedure for determining cleanliness of milk processing equipment is discussed. Calcium was removed from milk-contact surfaces by applications of 1 M HC1 and scraping with a plastic spatula. Quantities removed were determined by atomic absorption spectroscopy. The mean residual concentration of calcium on equipment after “control cleaning” was equivalent to 0.07 mg/100 cm2, and 95% confidence limits indicated insufficient cleaning if the residual was 0.08 mg/100 cm2 or higher. Suggestions for improving the method are included.
1This study was in part supported by a fellowship grant to the senior author from the Dairy and Food Industries Supply Association.
2Present Address: Meyer-Blanke Company, St. Louis, Missouri. Contribution from the Missouri Agricultural Experiment Station. Journal Series Number 5247.