FACTORS AFFECTING THE REMOVAL OF RADIOSTRONTIUM FROM MILK BY ION-EXCHANGE RESINS

Journal Article · Thu Oct 31 23:00:00 EST 1963 · Journal of Dairy Science (U.S.)

DOI:https://doi.org/10.3168/jds.S0022-0302(63)89247-4· OSTI ID:4087176

Easterly, D G; Harris, J Y; Bunce, L A; Edmondson, L F

Experiments were designed to determine the effect of temperature, direction of milk flow, milk flow rate, and quantity of milk passed through an ion-exchange column, on the removal of Sr from milk. Daily milk samples from a cow fed 0.5 mC Sr/sup 85/ (nitrate) were passed through a column 1.5-in. in dia containing 100 ml of Amberlite IR120 resin. The resin used was regenerated by passing 25 ml of charging solution per ml resin, containing 625, 83, 217, and 385 meq of Ca, Mg, Na, and K, respectively. This is approximates 10 times the concentration of these ions in normal milk. Milk temperature in the range 40 to 80 deg F did not affect the amount removed (about 85%) when the milk was acidified to a pH of 5.4. When milk was passed through at normal pH (6.65), about 8% more removal was obtained at 100 than at 40 deg F. No further increase was obtained by heating the milk to 180 deg F. However, less than half of the Sr was removed from nonacidified milk regardless of temperature. The temperature studies were carried out at a flow rate of 0.5 resin bed volume (rbv)/min. The amount removed from the first 30 rbv decreased from 96 to 71% as the flow rate was increased from 0.125 to 2.00 rbv/min. Studies comparing the relative effectiveness of downflow and upflow of milk through the columns showed that about 8% more Sr was removed by downflow at a flow rate of 0.25 rbv/min and 12% more at 1.0 rbv/min, than by upflow. This could be due to the turbulent action of the milk on the resin when the upflow procedure is employed, causing it to act more like a batch procedure. Under these conditions, the chromatographic effect of the column is lost. Results of these flow rate studies are in agreement with previous work which showed that milk-resin contact time had a significant effect on the removal of Sr and Ca from milk. (BBB)

• Research Organization: Dept. of Agriculture, Washington, D.C.
• Sponsoring Organization: USDOE
• NSA Number: NSA-18-013925
• OSTI ID: 4087176
• Journal Information: Journal of Dairy Science (U.S.), Journal Name: Journal of Dairy Science (U.S.) Vol. Vol: 46; ISSN JDSCA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ACIDITY
ADSORPTION
AMBERLITE
CALCIUM COMPOUNDS
CATIONS
CATTLE
CHEMISTRY
CONFIGURATION
CONTAMINATION
DECONTAMINATION
DIAGRAMS
EFFICIENCY
EXTRACTION COLUMNS
FOOD
ION EXCHANGE
ION EXCHANGE MATERIALS
LIQUID FLOW
MAGNESIUM COMPOUNDS
MEASURED VALUES
MILK
OPERATION
PERFORMANCE
POTASSIUM COMPOUNDS
QUANTITY RATIO
RADIOACTIVITY
RADIOISOTOPES
RESINS
SODIUM COMPOUNDS
SOLUTIONS
STRONTIUM 85
STRONTIUM COMPOUNDS
STRONTIUM ISOTOPES
STRONTIUM NITRATES
TEMPERATURE
TURBULENCE
VARIATIONS
WATER