Reference Material For Physical Testing

Short Description:

These certified reference materials consist of 16 coal samples with different sulfur content for using as analytical standards for coal analyses. In addition to sulfur, they are certified for their ash, volatile matter, calorific value, carbon, hydrogen, nitrogen and true relative density. All data are given in table 1.

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Product introduction

Each coal was air dried, reduced in size to <0.2mm, homogenized and packaged into individual bottled units.

Certified Values

Table 1 Certified values and Uncertainty for coal July-01-2021 to June -30-2022

GBW No.	Production Batch	Certified Value& Uncertainty	Sulfur S_t,d/%	Ash A_d/%	Volatile Matter V_d/%	Gross Calorific Value Q_gr,dMJ/kg	Carbon* C_d /%	Hydrogen* H_d /%	Nitrogen* N_d /%	True Relative Density (20℃) *	Characteristic of Char Residue*（CRC）	Coal Type
GBW11101	L	Certified Value	0.45	10.53	20.17	31.96	79.24	4.22	1.36	1.40	6	Bituminous
GBW11101	L	Uncertainty	0.03	0.07	0.22	0.16	0.38	0.10	0.04	0.02	6	Bituminous
GBW11102	c	Certified Value	1.59	9.70	34.48	30.17	73.46	4.65	1.36	1.41	5	Bituminous
GBW11102	c	Uncertainty	0.03	0.12	0.25	0.16	0.27	0.17	0.05	0.02	5	Bituminous
GBW11104	m	Certified Value	1.03	17.57	8.07	27.77	74.71	2.26	0.84	1.69	2	Anthracite
GBW11104	m	Uncertainty	0.02	0.12	0.20	0.11	0.22	0.10	0.04	0.03	2	Anthracite
GBW11105	j	Certified Value	1.74	16.86	7.86	27.98	74.73	2.37	0.98	1.67	2	Anthracite
GBW11105	j	Uncertainty	0.03	0.14	0.19	0.15	0.27	0.07	0.03	0.02	2	Anthracite
GBW11107	g	Certified Value	0.81	9.34	30.53	31.03	76.17	4.58	1.37	1.39	6	Bituminous
GBW11107	g	Uncertainty	0.02	0.09	0.30	0.15	0.26	0.09	0.02	0.02	6	Bituminous
GBW11107	i	Certified Value	0.82	9.05	30.54	31.12	76.32	4.54	1.38	1.40	6	Bituminous
GBW11107	i	Uncertainty	0.03	0.11	0.29	0.17	0.27	0.11	0.03	0.03	6	Bituminous
GBW11108	t	Certified Value	1.91	13.33	32.97	28.34	69.55	4.39	1.19	1.45	5	Bituminous
GBW11108	t	Uncertainty	0.03	0.11	0.20	0.16	0.23	0.14	0.05	0.03	5	Bituminous
GBW11109	s	Certified Value	2.83	31.30	29.21	21.82	53.18	3.66	0.93	1.62	5	Bituminous
GBW11109	s	Uncertainty	0.05	0.17	0.26	0.22	0.39	0.10	0.03	0.02	5	Bituminous
GBW11109	u	Certified Value	2.57	30.89	28.26	22.24	54.04	3.72	0.91	1.62	6	Bituminous
GBW11109	u	Uncertainty	0.06	0.17	0.28	0.22	0.48	0.13	0.03	0.02	6	Bituminous
GBW11110	q	Certified Value	4.35	28.92	20.47	22.91	56.99	3.23	0.94	1.66	4	Bituminous
GBW11110	q	Uncertainty	0.06	0.17	0.29	0.16	0.39	0.08	0.03	0.02	4	Bituminous
GBW11110	r	Certified Value	4.13	33.96	24.35	20.70	51.00	3.25	0.99	1.72	4	Bituminous
GBW11110	r	Uncertainty	0.07	0.20	0.31	0.19	0.40	0.09	0.04	0.02	4	Bituminous
GBW11111	u	Certified Value	1.73	15.72	23.54	29.26	72.07	4.14	1.18	1.45	6	Bituminous
GBW11111	u	Uncertainty	0.05	0.10	0.27	0.14	0.42	0.08	0.04	0.02	6	Bituminous
GBW11112	L	Certified Value	2.15	22.09	9.55	25.64	68.65	2.30	0.87	1.73	2	Anthracite
GBW11112	L	Uncertainty	0.06	0.13	0.31	0.15	0.39	0.09	0.04	0.02	2	Anthracite
GBW11113	L	Certified Value	3.42	16.18	11.99	28.68	72.56	3.28	1.03	1.53	2	Anthracite
GBW11113	L	Uncertainty	0.05	0.12	0.27	0.15	0.42	0.08	0.04	0.02	2	Anthracite
GBW11113	m	Certified Value	3.37	16.06	12.10	28.68	72.51	3.31	1.03	1.53	2	Anthracite
GBW11113	m	Uncertainty	0.06	0.12	0.30	0.17	0.35	0.07	0.04	0.02	2	Anthracite
GBW11126	g	Certified Value	0.27	9.49	8.14	32.21	83.28	3.16	1.15	1.47	2	Anthracite
GBW11126	g	Uncertainty	0.02	0.12	0.19	0.10	0.28	0.06	0.04	0.01	2	Anthracite

Note: * Indicates that it is not within the recommended scope for production proficiency of CNAS

Homogeneity Test and Stability

The homogeneity test was done on the bottled units by determination of ash and sulfur. The minimum weight of sample taken for analysis is 1.0g (ash) or 0.05g (sulfur). Variance analysis showed that the variability among different bottles was not significantly different from the variability between replicate determinations.

The validation of the certified values is one year. The certification will be performed for every year once revised certified values can be issued on application by Shandong Institute of Metallurgical Science Co., Ltd.

Characterization Of Methods

Characterization of methods using two or more methods of demonstrable accuracy in 9 competent laboratories.

Item	Analysis method
Total sulfur	GB/T 214-2007 Determination of total sulfur in coal, Eschka method
Ash and Volatile matter	GB/T 212-2008 Proximate analysis of coal
Gross calorific Value	GB/T 213-2008 Determination of calorific value of coal
Carbon and Hydrogen	GB/T 476-2008 Determination of carbon and hydrogen in coal
Nitrogen	GB/T 19927-2008 Determination of nitrogen in coal
True Relative Density	GB/T 217-2008 Determination of true relative density of coal

Assignment Of Property Values And Uncertainties

The certification analyses were performed using the Chinese National Standard （GB） methods by several qualified laboratories.

The certified value was expressed as X_T±U, where X_T is the mean value and U is the expanded uncertainty (95% confidence level). The uncertainty actually given in table 1 includes allowance for sample degradation within one year.

The statistical analysis and overall direction and coordination of the technical measurements leading to certification were performed by Shandong Institute of Metallurgical Science Co., Ltd.

Metrological Traceability

Before characterization of 9 qualified laboratories, the instruments and equipment used shall be verified or calibrated, and certified reference materials shall be used for monitoring during characterization to ensure the traceability of reference materials.

Package, Storage and Usage

1) These certified reference materials are packed in a brown glass bottle. Each weights 50g.

2) The bottle containing the materials must be kept tightly stopped and stored in cold and dry place, and opened only when necessary.

3) All data are expressed on dry bases. The moisture (moisture in the general analysis test sample) used for calculating the data on dry bases are determined according to moisture analysis method in GB/T 212-2008 “Proximate Analysis of Coal”.

4) The values given in table 1 of this certificate are those determined on July-01-2021 for CRM.