Trace Elements in Pine Needles – NIST 1575a

APPLICATION NOTE

Trace Elements in Pine Needles – NIST 1575a

SUMMARY

The application note summarizes the digestion of NIST 1575a, a pine needles standard reference material using ColdBlock Digestion Pro Series Technology.

Instrument:	ColdBlock CBM (with quartz test tubes), chiller, ICP-MS
Published:	July 2024
Digestion Time:	20 Minutes
Acid Used:	HNO₃ & H₂O₂
Average ColdBlock Recovery vs. CRM:	99% Iron 98% Phosphorus 106% Mercury

METHODOLOGY

Chiller temperature was set to -5°C
0.5g of each sample was weighed and placed into a quartz ColdBlock Digestion vessel
10 mL of HNO₃ was added
Sample was digested at 65% power for 20 minutes
2mL of ≥ 30% H2O2 was added slowly
Samples were cooled and bulked to 40mL using 2% HNO3 v/v

DISCUSSION

Samples were digested in triplicate
Samples were filtered prior to analysis by ICP-MS
NIST 1575a consists of dried, jet milled, radiation sterilized, blended pine needle

NIST 1575a after digestion and bulk up to 40mL

Results

NIST 1575a Trace Elements in Pine Needles
Method:	0.5g	10mL HNO3 65% power for 20 minutes, then slowly add 2mL of 30% H2O2
Element	Consensus Value (ppm)	+/-	Sample A	Sample B	Sample C	Average (ppm)	Stdev	RSD	Recovery
Al	580	30	574	586	596	585	8.7	1.5%	101%
Ba	6.0	0.2	5.3	5.9	6.2	5.8	0.4	6.6%	96%
Ca	2500	100	2502	2383	2574	2486	78.6	3.2%	99%
Cd	0.233	0.004	0.253	0.251	0.273	0.259	0.01	3.8%	111%
Cu	2.8	0.2	3.2	3.1	3.0	3.1	0.1	2.6%	111%
Fe	46	2	43	46	48	46	2.2	4.9%	99%
K	4170	70	4059	4062	4111	4077	23.8	0.6%	98%
P	1070	80	1185	1128	1127	1147	27.1	2.4%	107%
Rb	16.5	0.9	15.7	15.6	15.4	15.6	0.1	0.7%	94%
Zn	38	2	37	37	39	37	0.9	2.4%	98%
Hg	0.0399	0.0007	0.0421	0.0427	0.042	0.0424	0.0002	0.6%	106%

Click here to download the Application Note in PDF format.

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