Quality assurance

For Optical emission spectrometry inductively coupled optical emission spectrometry (ICP-OES)

Quality assurance

Calibration is carried out using multi element standrad solutions

	Element	Calibration range in mg/l
		from	to
Calibration sequence 1	Na	0,2	1000
	K, Mg, Ca	0,2	500
	Al	0,2	200
	P	0,2	60
	Fe, Mn	0,05	60
	Si, Be, Ag, B, Ba, Cd, Co, Cr, Cu, Li, Ni, Pb, Sr, Tl, Zn	0,05	10
Calibration sequence 2	As, Mo, Se, Sb, Sn, Ti, U, V, W, Zr	0,1	20
Calibration sequence 2	S	1	500

Details about the standards used may be found herepdf, 48 kb · de

Accuracy of the measurements is verified using a multi element standard solution (Bernd Kraft order number 02426.2000):

17 elements in about 1 mol/l nitric acid

500 mg/L: Ca, K, Mg, Na
50 mg/L: Al, Cd, Co, Cr, Cu, Fe, Mn, Ni, Pb, V, Zn
10 mg/L: B, Mo

Samples are diluted according to their matrix or their electrical conductivity for water samples, respectively, as follows.

Matrix	max. Total Dissolved Solids in g/L
Water	1,5
Total digestions	1,0 in max. 5% acid
Aqua regia/ Nitric acid digestions	2,0 in max. 5% acid
Extractions	10

All samples are prepared to contain at least 1% nitric acid. Three replicate measurements are carried out per sample. An outlier test according to Grubbs (significance 90%) is performed and mean and absolute standard deviation are reported.

Detection limits are calculated according to the 3 sigma criterium taking dilution into account.