Determination of 18 Trace Elements in 10 Batches of the Tibetan Medicine Qishiwei Zhenzhu Pills by Direct Inductively Coupled Plasma-Mass Spectrometry

Table 5

Linearity, LOQ, repeatability, precision, and recovery values for the elements.

Elements	Linear equation	R^2	BEC (ng·mL^−1)	Linear range (μg·L^−1)	LOQ (ng·mL^−1)	Repeatability (%)	Precision (%)	Average recovery	Recovery (%)
Li	Y = 183.452X + 30.010	0.9997	0.164	0∼50	0.0111	3.24	3.92	95.97	3.77
Be	Y = 120.419X + 1.646	0.9997	0.014	0∼50	0.0710	3.45	4.40	100.82	4.24
Sc	Y = 3568.724X + 38.237	0.9999	0.011	0∼50	0.0058	3.64	2.03	105.03	2.57
V	Y = 11335.341X + 785.694	0.9999	0.069	0∼50	0.0186	1.43	2.72	102.21	4.17
Cr	Y = 18508.555X + 9806.206	0.9998	0.530	0∼50000	0.0445	4.33	1.56	99.50	3.40
Mn	Y = 8186.298X + 5839.477	0.9999	0.713	0∼50000	0.0631	4.44	1.26	99.60	3.60
Co	Y = 33478.709X + 423.562	0.9998	0.013	0∼50	0.0030	4.05	2.35	96.56	3.81
Ni	Y = 8849.339X + 2884.817	0.9999	0.326	0∼50000	0.0611	1.66	2.52	104.69	2.13
Cu	Y = 23141.640X + 27031.196	0.9992	1.168	0∼50000	0.0769	4.32	1.39	99.31	3.73
As	Y = 1441.687X + 193.154	0.9999	0.134	0∼50000	0.0709	1.97	1.54	106.64	3.03
Sr	Y = 10750.883X + 18797.632	0.9990	1.748	0∼50000	0.0825	4.19	2.52	111.09	2.95
Ag	Y = 56823.927X + 172271.407	0.9882	3.032	0∼50000	0.2512	1.60	1.68	111.13	3.58
Cd	Y = 8600.838X + 114.995	0.9998	0.013	0∼50	0.0108	3.65	3.27	98.93	4.31
Cs	Y = 42739.545X + 791.782	0.9995	0.019	0∼50	0.0026	3.09	2.58	97.47	3.92
Ba	Y = 8843.577X + 38308.402	0.9993	4.332	0∼50000	0.1084	4.10	2.03	95.10	3.43
Au	Y = 66686.274X + 38970.881	0.9999	0.584	0∼50000	0.0517	4.31	3.82	99.96	3.22
Hg	Y = 20700.587X + 1037.767	0.9989	0.050	0∼200	0.0101	2.72	1.95	101.97	3.86
Pb	Y = 169100.063X + 223195.948	0.9996	1.320	0∼50000	0.1003	4.33	4.18	96.45	3.39

The elements are arranged in the order of their molecular weight.