Fluorine Testing
Midwest Microlab is capable of testing solid or liquid samples for total percentage of Fluorine with a range of 0.04% (4,000 ppm) to 100%. Accuracy for Fluorine testing is +/- 0.4. Please refer below for a brief description of the Fluorine analysis procedure including interferences and sample size. Air Sensitive / Glove Box handling is NOT available for Fluorine analysis.
Halogen Testing
Bromine Testing
Chlorine Testing
Fluorine Testing
Iodine Testing
Finding Total Percentage of Fluorine
Fluorine Analysis & Techniques
Midwest Microlab performs Fluorine analysis using the micro bomb and Ion Selective Electrode ( ISE ) Method.
For testing, the appropriate size solid sample is weighed and inserted into a micro bomb. Then the micro bomb is charged with the appropriate reagents to completely digest the F compound. The apparatus is clamped shut and heated in a flame for 60 seconds. The contents are washed out and diluted.
The readings taken with the electrode are compared against readings from two dilutions of NaF standard. A standardization check is done every time Fluorine is determined.
Due to the excessive exposure of the sample to the environment in Fluorine determination, we are not able to determine Fluorine on air-sensitive samples.
With some modifications this determination is carried out according to the method of Ma and Rittner (“Modern Organic Elemental Analysis” Marcel Dekker Inc. New York, NY 1979)
Interferences Associated with Fluorine Analysis:
Known Interference’s for Fluorine Analysis include Hydroxides: Ba(OH)2 , Ca(OH)2 , KOH, LiOH, NaOH, Sr(OH)2 . Additional interferences include: Al, B, Ba, Ca, Fe, K, La, Li, Na, Si and Sr.
Please note the interferences above cannot be circumvented during analysis. Irregular results can be reported due to an interference within the molecular formula of the sample. Please note irregular results due to interferences cannot be interpreted by the chemists. Midwest Microlab chemists will perform requested analysis and report results as found with the understanding that the submitter understood the interferences associated and how it may affect results. Please indicate all elements or the molecular formula on the submission form.
Suggested Sample Size according to Total Percentage Theory:
Theory % Fluorine Single Fluorine Duplicate Fluorine Triplicate
0-5 % 25 mg 50 mg 75 mg
5-20% 20 mg 40 mg 60 mg
Above 20% 15 mg 30 mg 45 mg
Turnaround Time
Fluorine is a complex and labor intensive determination. Standard Turnaround time for the total percentage of Fluorine results is within 5 business days. RUSH services are available for an additional fee per sample, per analysis with per single run. Rush results turnaround time for Fluorine analysis is within 3-4 business days.
Midwest Microlab does NOT handle any samples containing Osmium, Uranium, or Thallium within the molecular formula.Midwest Microlab is able to perform samples with Depleted Uranium but must be clearly indicated on the submission form. Please indicate on the comments section of the submission form if samples have a high toxicity or strong stench. We do not handle any Finished Pharmaceuticals for release or highly volatile liquid samples with boiling points of less than 40 deg C.
Fluorine Analysis & Techniques: What is Fluorine?
Atomic weight 18.99, Atomic Number 9, Melting Point -219.62 C, Boiling Point -188.15C.
Fluorine (from L. fluere, meaning “to flow”), is the chemical element in the periodic table that has the symbol F and atomic number 9. Atomic F is univalent and is the most chemically reactive and electronegative of all the elements.
In its pure form, it is a poisonous, pale, yellow-green gas, with chemical formula F2. Like other halogens, molecular level is highly dangerous; it causes severe chemical burns on contact with skin.
This element has relatively large electronegativity and small atomic radius makes it have some interesting bonding characteristics.
Pure F (F2, since fluorine is diatomic) is a corrosive pale yellow gas that is a powerful oxidizing agent. It is the most reactive and electronegative of all the elements, and readily forms compounds with most other elements.
This element even combines with the noble gases, krypton, xenon, and radon. Even in dark, cool conditions, fluorine reacts explosively with hydrogen. It is so reactive that glass, metals, and even water, as well as other substances, burn with a bright flame in a jet of fluorine gas.
It is far too reactive to be found in elemental form and has such an affinity for most elements, including silicon, that it can neither be prepared nor be kept in glass vessels. In moist air it reacts with water to form the equally dangerous hydrofluoric acid.
In aqueous solution, fluorine commonly occurs as the fluoride ion F-. Other forms are fluoro-complexes, such as [FeF4]-, or H2F+.
Fluorides are compounds that combine fluorine with some positively charged counterpart. They often consist of ions. Element F compounds with metals are among the most stable of salts.
Relevant sites:
Process for preparing fluorine – containing organic compounds…
A method for the preparation of a fluorine – containing organic compound which comprises reacting a sulphonyl halide of the formula: RfSO.sub.2 X where Rf…
Electronegativity – polar bonds in organic compounds
Halogen: a member of group VII of the Periodic Table – fluorine, chlorine, bromine and iodine. Halide: a compound of one of these – e.g. hydrogen chloride…
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