Fluoride Working Group Meeting Book (December 14, 2017)

References 8-9 are listed in slide 16

• Open ashing • (Alkali) Fusion • Microdiffusion separation • KdžLJŐĞŶ combustion • High pressure acid digestion • (Ultrasonic) Extraction/WƌŽƚĞŝŶ precipitation/Ultracentrigugation • ŝƐƚŝůůĂƚŝŽŶ • Headspace (single-drop micro-extraction) • ĞƌŝǀĂƚŝnjĂƚŝŽŶ Some procedures are available for measuring total and/or free forms of fluoride in milk products.

September 2016

5

References 8-9 are listed in slide 16

• ůĞĐƚƌŽĐŚĞŵŝƐƚƌLJ:

- WŽƚĞŶƚŝŽŵĞƚƌLJ (Fluoride Ion Selective Electrode : current method) - sŽůƚĂŵĞƚƌLJ (Wolarographic methods)

• ŚƌŽŵĂƚŽŐƌĂƉŚLJ:

- Ion ŚƌŽŵĂƚŽŐƌĂƉŚLJ - ŽŶĚƵĐƚŝǀŝƚLJ detection ͬ WŽƐƚ- column reaction with UV/VIS detector (anion current method) - Headspace Gas ŚƌŽŵĂƚŽŐƌĂƉŚLJ - &/ ͬ D^ after ĚĞƌŝǀĂƚŝnjĂƚŝŽŶ - ^ƉĞĐƚƌŽƉŚŽƚŽŵĞƚƌLJ ;ĨŽƌ ǁĂƚĞƌƐͿ - Graphite furnace - MAS (most sensitive technique for fluoride) - D/W- ^ ͬ / W-MSMS

• ^ƉĞĐƚƌŽƐĐŽƉLJ:

• dŝƚƌŝŵĞƚƌLJ (Titration against thorium nitrate) column reaction • Sensors

6

September 2016