Table 1 Physico-chemical and radioactivity analyses of cave sediment and CAFAS from Divaška jama.

Parameter	Unit in DW	Meas. uncertainty	Method/reference	TEC for freshwater sediment*	Limit value for soil treatment**	Sediment	CAFAS
Ash	%	± 5%	ISO 11465			96.0	71.2
Dry mass	%	± 5%	ISO 11465			77.3	69.2
POM	%	± 5%	Dean 1974²²			3.2	37.0
pH		± 0.1 pH	ISO 10390			7.20	7.29
C	%	± 15%	ISO 10694			3.96	28.8
N	%	± 15%	ISO 5663			0.28	0.69
P	g/kg	± 20%	ISO 11263			0.46	0.76
S	%	± 20%	ISO 15178			0.007	< 0.007
Al	mg/kg	± 20%	ISO 12020			42,100	38,600
As	mg/kg	± 20%	ISO 15586	9.79		8.57	15.0
Be	mg/kg	± 20%	ISO 15586			1.02	1.61
Ca	g/kg	± 20%	ČSN 46 7092			5.21	66.7
Cd	mg/kg		ISO 5961	0.99	1	< 0.41	< 0.41
Co	mg/kg	± 20%	ISO 8288			25.3	10.9
Cr	mg/kg	± 20%	ISO 5961	43.4	100	109	39.5
Cu	mg/kg	± 20%	ISO 5961	31.6	60	48.7	477
Fe	mg/kg	± 20%	ČSN 75 7385^a			43,250	48,720
Hg	mg/kg	± 15%	ČSN 75 7440*	0.18	0.8	0.082	0.205
K	g/kg	± 20%	ČSN 46 7092			9.95	3.73
Mg	g/kg	± 20%	ČSN 46 7092			7.91	5.09
Mn	mg/kg	± 20%	ČSN 757385^a			1340	474
Na	g/kg	± 20%	ČSN 46 7092			0.19	2.43
Ni	mg/kg	± 20%	ISO 5961	22.7	50	130	32.4
Pb	mg/kg	± 20%	ISO 5961	35.8	85	11.8	162
V	mg/kg	± 20%	ISO 15586			78.3	95.8
Zn	mg/kg	± 20%	ISO 5961	121	200	97.9	205
Radiation	cpm					65	63
Radionuclide
²³⁸U (1)	Bq/kg					33.0 ± 6.8	153.7 ± 26.8
²²⁶Ra (1)	Bq/kg					23.9 ± 1.0	119.6 ± 2.0
²¹⁰Pb (1)	Bq/kg					19.7 ± 3.4	140.0 ± 11.5
²²⁸Ra (2)	Bq/kg					35.0 ± 1.3	33.3 ± 1.2
²¹²Pb (2)	Bq/kg					33.7 ± 1.2	33.9 ± 1.2
²²⁸Th (2)	Bq/kg					30.7 ± 1.5	27.9 ± 1.3
⁴⁰K	Bq/kg					476.5 ± 26.7	115.8 ± 8.0

The stated measurement uncertainty is the product of the standard measurement uncertainty and the expansion coefficient k = 2, which corresponds approximately to 95% coverage probability for normal distribution. Values shown in bold are those that exceed either threshold effect concentration (TEC) below which harmful effects are unlikely to be observed in freshwater ecosystems (MacDonald et al.²³) (*) and/or limit values for heavy metals in soil set by Decree on the management of sewage sludge from urban waste water treatment plants, Uradni list RS 2008, 62/08 (**).
ČSN National standards of the Czech Republic; ^aFlame atomic absorption spectrometric method; *Determination of total mercury by thermal decomposition, amalgamation and atomic absorption spectrometry; (1) uranium decay chain, (2) thorium decay chain.

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