Derivation and Application of Signal-to-background-to-concentration Ratio for Atomic Emission Spectrometry†

doi:10.7503/cjcu20180801

Abstract

Abstract:

The concept of signal-to-background-concentration ratio(SBCR) was derived and proposed to be a useful tool for judgement of the excitation power of an atomic excitation source(e.g., MPT) for atomic spectrometry based on the linear relationship between signal intensity, CCD integration period and sample concentration. The relationship between detection limit and SBCR was derived according to the definition of detection limit. The predicted expressions of maximum integration period, maximum signal-to-background ratio, and maximum SBCR were derived based on reasonable assumptions. The above model was verified by experiments. Finally, the excitation capability of low-power ArMPT for copper was characterized by this SBCR method, and the detection limit of Cu was improved from 13.1 ng/mL to 2.8 ng/mL.

Key words: Atomic emission spectrometry, Signal-to-background ratio, Signal-to-background-concentration ratio

CLC Number:

O657.31

TrendMD:

YU Bingwen,JIN Wei,JIN Qinhan,LIU Xu. Derivation and Application of Signal-to-background-to-concentration Ratio for Atomic Emission Spectrometry^†[J]. Chem. J. Chinese Universities, 2019, 40(5): 880.

Figures/Tables 7

References 21

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Microwave power/W	110	Peristaltic pump speed/(r·min^-1)	45
Support gas flowrate/(L·min^-1)	0.3	No. of spectrometer	#2
Carrier gas flowrate/(L·min^-1)	0.5	CCD integration period/ms	100, 200, 300, 400, 1200
Heating temperature/℃	140	No. of spectrum averages	25
Condensation temperature/℃	2

Microwave power/W	110	Peristaltic pump speed/(r·min^-1)	45
Support gas flowrate/(L·min^-1)	0.3	No. of spectrometer	#2
Carrier gas flowrate/(L·min^-1)	0.5	CCD integration period/ms	100, 200, 300, 400, 1200
Heating temperature/℃	140	No. of spectrum averages	25
Condensation temperature/℃	2

t/ms	Concentration/(μg·mL^-1)						RSD_b(%)	k_st	SBCR	DL/(ng·mL^-1)
t/ms	0	0.01	0.1	0.5	1	5	RSD_b(%)	k_st	SBCR	DL/(ng·mL^-1)
100	1429.6	—		1656.9	1865.1	3660.2	0.14	446.2	0.31	13.1
200	2115.1	—	—	2582.1	3018.3	6740.4	0.15	925.6	0.44	10.1
300	2781.3	—	—	3497.1	4153.5	9979.8	0.15	1442.7	0.52	8.9
400	3432.1	—	—	4407.3	5292.8	12806.1	0.17	1872.7	0.55	9.1
1200	8436.1	8495.3	9005.5	11270.8	—	—	0.06	5666.5	0.67	2.8
Infinite									0.75

t/ms	Concentration/(μg·mL^-1)						RSD_b(%)	k_st	SBCR	DL/(ng·mL^-1)
t/ms	0	0.01	0.1	0.5	1	5	RSD_b(%)	k_st	SBCR	DL/(ng·mL^-1)
100	1429.6	—		1656.9	1865.1	3660.2	0.14	446.2	0.31	13.1
200	2115.1	—	—	2582.1	3018.3	6740.4	0.15	925.6	0.44	10.1
300	2781.3	—	—	3497.1	4153.5	9979.8	0.15	1442.7	0.52	8.9
400	3432.1	—	—	4407.3	5292.8	12806.1	0.17	1872.7	0.55	9.1
1200	8436.1	8495.3	9005.5	11270.8	—	—	0.06	5666.5	0.67	2.8
Infinite									0.75