ASTM D5837 Standard Test Method for Furanic Compounds in Electrical Insulating Liquids by High-Performance Liquid Chromatography (HPLC)
17. Report
17.1 Report the following information:
17.1.1 A reference to this test method,

17.1.2 Identification of the test specimen, and

17.1.3 Concentration in the test specimen of each furanic compound determined.

18. Precision and Bias
18.1 Repeatability:
18.1.1 An estimate ofrepeatability by standard deviation for liquid/liquid extraction offuranic compounds in mineral oil has been found by one laboratory to be as follows for ten replicates:
95 % repeatability interval as % of mean (nominal concentration of 100 µg/kg):
5-hydroxymethyl-2-furaldehyde: 11.7 %
furfuryl alcohol: 5.2 %
2-furaldehyde: 8.0 %
2-acetylfuran: 5.5 %
5-methyl-2-furaldehyde: 3.3 %

95 % repeatability interval as % of mean (nominal concentration of 1000 µg/kg):
5-hydroxymethyl-2-furaldehyde: 2.7 %
furfuryl alcohol: 5.3 %
2-furaldehyde: 2.4 %
2-acetylfuran: 0.6 %
5-methyl-2-furaldehyde: 3.2 %

18.1.2 An estimate of repeatability by standard deviation for solid phase extraction of furanic compounds in mineral oil has been found by one laboratory to be as follows for ten replicates:
95 % repeatability interval as % of mean (nominal concentration of 100 µg/kg):
5-hydroxymethyl-2-furaldehyde: 5.5 %
furfuryl alcohol: 16.7 %
2-furaldehyde: 6.0 %
2-acetylfuran: 7.7 %
5-methyl-2-furaldehyde: 6.0 %

95 % repeatability interval as % of mean (nominal concentration of 1000 µg/kg):
5-hydroxymethyl-2-furaldehyde: 10.2 %
furfuryl alcohol: 13.7 %
2-furaldehyde: 9.6 %
2-acetylfuran: 11.0 %
5-methyl-2-furaldehyde: 11.0 %

18.1.3 An estimate for repeatability by standard deviation for the direct injection method of furanic compounds in mineral oil has been found by one laboratory to be as follows for ten replicates:
95 % repeatability interval as % of mean (nominal concentration of 100 µg/kg):
5-hydroxymethyl-2-furaldehyde: 4.9 %
2-furaldehyde: 10.6 %
2-acetylfuran: 12.6 %
5-methyl-2-furaldehyde: 6.0 %

95 % repeatability interval as % of mean (nominal concentration of 1000 µg/kg):
5-hydroxymethyl-2-furaldehyde: 3.9 %
2-furaldehyde: 3.7 %
2-acetylfuran: 3.2 %
5-methyl-2-furaldehyde: 2.1 %

18.2 Reproducibility - A round-robin is planned to establish reproducibility of this test method.

18.3 Bias - A round-robin is planned to establish bias of this test method.

19. Keywords
19.1 direct injection; furaldehyde; furanic; furanoid; furans; furfural; furfuraldehyde; furfuryl alcohol; furfurylfurfurol; furyl; HPLC; liquid/liquid extraction; solid-phase extraction; SPE; 5-hydroxymethyl-2-furaldehyde; 2-furaldehyde; 2-acetylfuran; 5-methyl-2-furaldehyde