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5443063 
Journal Article 
COLORIMETRIC DETERMINATION OF BORON IN AQUEOUS SOLUTIONS AND IN BOROSILICATE GLASS BY SOLVENT EXTRACTION 
Tenney, AS 
1973 
BORON IN AQUEOUS SOLUTIONS CAN BE DETERMINED BY ADDING DILUTE HF AND METHYLENE BLUE SOLUTION TO THE SAMPLE IN A POLYETHYLENE DROPPING BOTTLE, SHAKING, ALLOWING TO STAND FOR ONE HOUR, ADDING 1,2-DICHLOROETHANE, SHAKING, ALLOWING TO STAND OVERNIGHT, AND READING THE ABSORBANCE IN THE RANGE 4000-7000 ANGSTROMS WITH A DOUBLE-BEAM RECORDING SPECTROPHOTOMETER. STANDARDS ARE PREPARED FROM BORIC ACID SOLUTION. ABSORBANCE CURVES SHOW THREE PEAKS AT 4900, 6050-6300, AND 6750 ANGSTROMS. CALIBRATION CURVES SHOW THAT BORON CAN BE DETERMINED IN THE RANGE 0-5 MICROGRAMS/ML WITH AN UNCERTAINTY OF PLUS OR MINUS 0.05-0.1 MICROGRAM/ML USING RESULTS FROM THE TWO MAJOR PEAKS. THE DETECTION LIMIT IS ABOUT 0.1 MICROGRAM IN A 2.0 ML SAMPLE. THE PROCEDURE IS SIMPLER THAN OTHER METHODS BECAUSE THE DOUBLE-BEAM SPECTROMETER SUBTRACTS ABSORBANCE OF THE BLANK AND BECAUSE NO PROCEDURE IS EMPLOYED TO REMOVE INTERFERING IONS SUCH AS NO3(MINUS), AS(5 MINUS) AND CR(6 MINUS). (LITTLE-BATTELLE) 
Water Resources Abstracts; COLORIMETRY; AQUEOUS SOLUTIONS; SPECTROPHOTOMETRY; WATER ANALYSIS; ABSORPTION; SAMPLE PREPARATION; DETECTION LIMITS; CHEMICAL INTERFERENCE; CALIBRATION CURVES