The intra-laboratory study of EIM-IRMS® (Ethanol Isotope Measurement–Isotope Ratio Mass Spectrometry) method performance with CS-qNMR (Cumulative Screening–quantitative NMR)

Open Access

Table 3

EIM-IRMS^® and CS-qNMR results with intra-laboratory repeatability and reproducibility calculation. Table 3a Ethanol δD_n values (‰ vs. AAWES) (Reference material: AFUSALI - Afusali Authentic Wine Ethanol Standard (AAWES) with value -211.89‰).

Sample No.	Sample name	Ethanol δD_n (‰ vs. AAWES)	Intra-laboratory Reproducibility standard deviation sR(‰)*	Intra-laboratory Repeatability standard deviation sr (‰)**	Amount of beet sugar ethanol in overall wine ethanol (%)
1	Natural I	-199.25	0.21	0.21	0.00
2	I-20	-203.31	0.64	1.64	13.10
3	I-30	-204.64	2.11	0.84	17.04
4	I-40	-206.53	2.68	0.89	22.62
5	I-50	-207.79	1.39	1.11	26.05
6	I-water15	-210.58	0.92	0.25	15 ¹⁾
7	I-water20	-214.05	1.44	2.02	20 ¹⁾
8	I-sugar syrup	-215.46	1.28	1.45	12.26²⁾
9	Natural II	-207.28	1.69	0.59	0.00
10	II-20	-213.72	0.58	2.03	10.30
11	II-30	-216.32	0.82	1.02	14.36
12	II-40	-218.14	1.18	1.02	17.37
13	II-50	-219.46	1.61	1.20	19.83
14	II-water15	-218.44	0.97	1.30	15¹⁾
15	II-water20	-220.61	1.30	0.88	20¹⁾
16	II-sugar syrup	-214.91	1.17	1.00	4.48²⁾
17	Natural III	-215.11	0.02	0.02	0.00
18	III-20	-222.50	0.48	0.69	13.06
19	III-30	-224.62	2.78	1.80	15.68
20	III-40	-227.80	2.19	0.95	20.85
21	III-50	-228.74	0.95	1.37	22.46
22	III-water15	-223.60	1.33	1.27	15¹⁾
23	III-water20	-228.22	1.70	1.51	20¹⁾
24	III-sugar syrup	-225.22	0.66	1.32	12.60²⁾
Average:			1.25	1.10

STDEV of all measurements of the same sample.

^**

Average STDEV for the same sample.

¹⁾

Dilution with tap water %( v/v).

²⁾

Expressed as percentage of beet sugar ethanol from sugar syrup in overall wine ethanol. Precision of the measurements represents average value of srand sR: 1.175 ‰.

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