Validation and quality assurance applied to goat milk chemical composition: Minerals and trace elements measurementsValidation et assurance qualité appliquée à la composition chimique du lait de chèvre : mesures des minéraux et éléments traces.

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Table VI.

Relative standard uncertainty of trueness component estimated from spiked milk samples.

Element	Method	(mg·kg⁻¹)	w_spike (mg·kg⁻¹)	u(w_spike) (mg·kg⁻¹)	(mg·kg⁻¹)	(mg·kg⁻¹)		t_cal
Mn	FAAS	0.14	0.097	0.001	0.24	0.009	0.11	0.2
		0.14	0.093	0.001	0.23	0.008	0.11	0.8
		0.14	0.25	0.001	0.36	0.013	0.06	1.8
Cr	ETAAS	0.038	0.0041	0.00007	0.0089	0.00087	0.17	1.5
Cr	ETAAS	0.038	0.010	0.00017	0.013	0.00087	0.13	0.58
Mo	ETAAS	0.029	0.010	0.00017	0.015	0.0015	0.14	1.8
		0.029	0.009	0.00017	0.012	0.0012	0.15	0.4
		0.029	0.020	0.00033	0.025	0.0028	0.13	0.9
Cd	ETAAS	–	0.0020	0.00005	0.0021	0.00019	0.09	1.0
		–	0.0020	0.00005	0.0021	0.00019	0.09	1.2
		–	0.0051	0.00010	0.0060	0.00052	0.09	1.9
		–	0.0050	0.00010	0.0060	0.00052	0.09	2.0
Pb	ETAAS	–	0.019	0.0030	0.0022	0.0019	0.09	1.3
			0.039	0.0070	0.0046	0.0039	0.09	1.8
		–	0.039	0.0070	0.0040	0.0034	0.09	0.1
		–	0.060	0.0012	0.0065	0.0057	0.09	0.9
Ni	ETAAS	–	0.014	0.00025	0.012	0.0011	0.08	1.7
Ni	ETAAS	–	0.014	0.00025	0.011	0.0010	0.08	2.0
Co	ETAAS	–	0.014	0.00025	0.012	0.0011	0.09	1.6
Co	ETAAS	–	0.014	0.00025	0.011	0.0010	0.09	2.0

, mass fraction of each element; w_spike, mass fraction of the spiked element; u(w_spike), standard uncertainty of the spiked mass fraction; , observed mass fraction; , relative standard uncertainty of the recovery; , relative standard uncertainty of the mean recovery (equation (9)); t_cal, significant statistic test [6]; –, results lower than the limit of quantification (mass fraction).