Table 1
Comparison of the parameters of the used analysis methods
Parameter	Titration	F-ISE	Cuvette test
Analyte	HF	HF	Organic content
Measurement method	Indirect	Direct	Direct
Measurement range	>50 mmol L−1	0.05 to 50 mmol L−1	0.08 to 2.7 mmol L−1
Time for measurement	15 min	5 min	4 h
Time for calibration	5 mina	15 minb	Only once
Suitable for acetic acid containing electrolytes?	No	Yes	Yes
Relative error	3.3 %	1.5 %	2.1 %
Standard deviation	0.1 mol L−1(n = 10)	0.2 mol L−1(n = 10)	0.01 mol L−1(n = 20)
Inline analysis possible?	Yes	Yes	No

^aOnce a week. ^bDirectly before measurement.

Nehmann et al. Nanoscale Research Letters 2012 7:398   doi:10.1186/1556-276X-7-398