AS 3580.13.3-1993

1 - AS 3580.13.3-1993 METHODS FOR SAMPLING AND ANALYSIS OF AMBIENT AIR - DETERMINATION OF FLUORIDES-TOTAL GASEOUS AND...
1 - PREFACE
1 - FOREWORD
1 - METHOD
1 - 1 SCOPE
2 - 2 REFERENCED DOCUMENTS
2 - 3 PRINCIPLE
2 - 4 REAGENTS
2 - 4.1 General requirements
2 - 4.2 Solutions
2 - 4.2.1 Sodium hydroxide solution (200 g/L)
2 - 4.2.2 Sodium acetate absorbing solution
2 - 4.2.3 Total ionic strength adjustment buffer (TISAB)
2 - 4.3 Standard solutions
2 - 4.3.1 Stock fluoride solution (1 mL = 1 mg HF)
2 - 4.3.2 Standard fluoride solution (1 mL = 20 ug HF)
3 - 4.3.3 Working standard fluoride solution (1 mL = 0.2 ug HF)
3 - 5 APPARATUS
3 - 5.1 Glassware
3 - 5.2 Sampling train
3 - 5.3 Specific ion meter or expanded scale pH meter
3 - 5.4 Combination fluoride ion-selective electrode or separate fluoride ion and reference electrodes
3 - 5.5 Magnetic stirrer and PTFE-coated spin bars
3 - 5.6 Plastic beakers and containers
3 - 6 SAMPLING
3 - 6.1 Location
5 - 6.2 Sampling
5 - 6.2.1 Absorption U-tube preparation
6 - 6.2.2 Sampling procedure
6 - 7 PROCEDURE
6 - 7.1 Extraction
7 - 7.2 Determination
7 - 7.2.1 Calibration
7 - 7.2.2 Test solution measurement
8 - 8 CALCULATIONS
8 - 9 PRECISIONCollection
8 - 10 TEST REPORT

Sets out a method for the collection of gaseous and acid-soluble airborne particulate fluoride from ambient air and the determination of the total fluoride collected by use of an ion-selective electrode.

This Standard sets out a method for the collection of total gaseous and acid-soluble airborne particulate fluoride in ambient air and its analysis using a fluoride ion-selective electrode.The method is applicable to total gaseous and acid-soluble airborne particulate fluoride in ambient air at concentrations of 0.01ug/m3 or greater.The upper limits of determination are 2000 ug/m3 of hydrogen fluoride where a 10% (m/V) sodium acetate solution is used and 700 ug/m3 where a 5% (m/V) sodium acetate solution is used for collection. These values are based on a one day sampling period and a sampler flow rate of 10 L/min.The presence of acidic gases other than hydrogen fluoride affects the upper limit of determination.NOTE: This method is subject to certain interferences. However, the addition of total ionic strength adjustment buffer (TISAB) eliminates a number of possible interferences. Variation in ionic strength is overcome by maintaining a high concentration of sodium chloride in the TISAB solution. Interference from hydroxide ions is overcome by buffering the TISAB solution to a pH of between 5 and 6. The effects of metallic ions are minimized by the addition of a complexing agent.

First published as AS 3580.13.3-1993.