Accreditation and Quality Assurance

Accreditation and Quality Assurance (Accred. Qual. Assur.; "ACQUAL") publishes conceptual and practice-oriented articles on all aspects relevant to quality, transparency and reliability of measurement results in chemical and biological sciences. This is aimed at disseminating knowledge and contributing to the elimination of conceptual and technical barriers to intercontinental understanding ("CBU" and "TBU"). It is in this context that ACQUAL asks the authors for clarity in the presentation of their results by following international conventions or by defining deviations without ambiguity. The journal aims at serving the information needs of researchers, practitioners and decision makers alike. It provides problem solving for improved measurement practice, covers aspects of related education and training, and fosters cooperation between national and international bodies operating in accreditation and quality assurance of measurements in chemical and biological sciences. The journal is focusing on the following topics: Accreditation; Quality assurance; Tools for quality control; Quality management; Metrology in chemistry; Traceability of measurement results; Measurement uncertainty; Comparability and equivalence of measurement results; Verification and validation; Calibration; Statistical simulations; Purity assessment; Sampling; Interlaboratory comparison (PT, EQA); Reliability; Reference materials; Reference measurements, dissemination and propagation of reference values; Applied statistics for metrology; Concepts and terminology; Quantities and units.

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Quartiles

The set of journals have been ranked according to their SJR and divided into four equal groups, four quartiles. Q1 (green) comprises the quarter of the journals with the highest values, Q2 (yellow) the second highest values, Q3 (orange) the third highest values and Q4 (red) the lowest values.

Category	Year	Quartile
Chemical Engineering (miscellaneous)	1999	Q1
Chemical Engineering (miscellaneous)	2000	Q2
Chemical Engineering (miscellaneous)	2001	Q1
Chemical Engineering (miscellaneous)	2002	Q2
Chemical Engineering (miscellaneous)	2003	Q2
Chemical Engineering (miscellaneous)	2004	Q2
Chemical Engineering (miscellaneous)	2005	Q2
Chemical Engineering (miscellaneous)	2006	Q2
Chemical Engineering (miscellaneous)	2007	Q2
Chemical Engineering (miscellaneous)	2008	Q2
Chemical Engineering (miscellaneous)	2009	Q2
Chemical Engineering (miscellaneous)	2010	Q2
Chemical Engineering (miscellaneous)	2011	Q2
Chemical Engineering (miscellaneous)	2012	Q2
Chemical Engineering (miscellaneous)	2013	Q2
Chemical Engineering (miscellaneous)	2014	Q2
Chemical Engineering (miscellaneous)	2015	Q2
Chemical Engineering (miscellaneous)	2016	Q2
Chemical Engineering (miscellaneous)	2017	Q2
Chemical Engineering (miscellaneous)	2018	Q2
Chemical Engineering (miscellaneous)	2019	Q3
Chemical Engineering (miscellaneous)	2020	Q3
Chemical Engineering (miscellaneous)	2021	Q3
Chemical Engineering (miscellaneous)	2022	Q3
Chemical Engineering (miscellaneous)	2023	Q3
Chemistry (miscellaneous)	1999	Q2
Chemistry (miscellaneous)	2000	Q2
Chemistry (miscellaneous)	2001	Q2
Chemistry (miscellaneous)	2002	Q2
Chemistry (miscellaneous)	2003	Q2
Chemistry (miscellaneous)	2004	Q2
Chemistry (miscellaneous)	2005	Q2
Chemistry (miscellaneous)	2006	Q2
Chemistry (miscellaneous)	2007	Q2
Chemistry (miscellaneous)	2008	Q2
Chemistry (miscellaneous)	2009	Q2
Chemistry (miscellaneous)	2010	Q2
Chemistry (miscellaneous)	2011	Q2
Chemistry (miscellaneous)	2012	Q2
Chemistry (miscellaneous)	2013	Q2
Chemistry (miscellaneous)	2014	Q2
Chemistry (miscellaneous)	2015	Q2
Chemistry (miscellaneous)	2016	Q3
Chemistry (miscellaneous)	2017	Q3
Chemistry (miscellaneous)	2018	Q3
Chemistry (miscellaneous)	2019	Q3
Chemistry (miscellaneous)	2020	Q4
Chemistry (miscellaneous)	2021	Q3
Chemistry (miscellaneous)	2022	Q3
Chemistry (miscellaneous)	2023	Q3
Instrumentation	1999	Q2
Instrumentation	2000	Q3
Instrumentation	2001	Q2
Instrumentation	2002	Q3
Instrumentation	2003	Q2
Instrumentation	2004	Q2
Instrumentation	2005	Q2
Instrumentation	2006	Q3
Instrumentation	2007	Q2
Instrumentation	2008	Q2
Instrumentation	2009	Q2
Instrumentation	2010	Q2
Instrumentation	2011	Q2
Instrumentation	2012	Q2
Instrumentation	2013	Q2
Instrumentation	2014	Q3
Instrumentation	2015	Q3
Instrumentation	2016	Q3
Instrumentation	2017	Q3
Instrumentation	2018	Q3
Instrumentation	2019	Q3
Instrumentation	2020	Q4
Instrumentation	2021	Q3
Instrumentation	2022	Q3
Instrumentation	2023	Q3
Safety, Risk, Reliability and Quality	1999	Q1
Safety, Risk, Reliability and Quality	2000	Q2
Safety, Risk, Reliability and Quality	2001	Q1
Safety, Risk, Reliability and Quality	2002	Q2
Safety, Risk, Reliability and Quality	2003	Q2
Safety, Risk, Reliability and Quality	2004	Q2
Safety, Risk, Reliability and Quality	2005	Q2
Safety, Risk, Reliability and Quality	2006	Q2
Safety, Risk, Reliability and Quality	2007	Q2
Safety, Risk, Reliability and Quality	2008	Q2
Safety, Risk, Reliability and Quality	2009	Q2
Safety, Risk, Reliability and Quality	2010	Q2
Safety, Risk, Reliability and Quality	2011	Q2
Safety, Risk, Reliability and Quality	2012	Q2
Safety, Risk, Reliability and Quality	2013	Q2
Safety, Risk, Reliability and Quality	2014	Q2
Safety, Risk, Reliability and Quality	2015	Q2
Safety, Risk, Reliability and Quality	2016	Q3
Safety, Risk, Reliability and Quality	2017	Q3
Safety, Risk, Reliability and Quality	2018	Q3
Safety, Risk, Reliability and Quality	2019	Q3
Safety, Risk, Reliability and Quality	2020	Q3
Safety, Risk, Reliability and Quality	2021	Q3
Safety, Risk, Reliability and Quality	2022	Q3
Safety, Risk, Reliability and Quality	2023	Q3

SJR

The SJR is a size-independent prestige indicator that ranks journals by their 'average prestige per article'. It is based on the idea that 'all citations are not created equal'. SJR is a measure of scientific influence of journals that accounts for both the number of citations received by a journal and the importance or prestige of the journals where such citations come from It measures the scientific influence of the average article in a journal, it expresses how central to the global scientific discussion an average article of the journal is.

Year	SJR
1999	0.585
2000	0.360
2001	0.583
2002	0.288
2003	0.389
2004	0.478
2005	0.374
2006	0.324
2007	0.429
2008	0.396
2009	0.443
2010	0.353
2011	0.365
2012	0.365
2013	0.397
2014	0.347
2015	0.374
2016	0.299
2017	0.316
2018	0.309
2019	0.220
2020	0.193
2021	0.289
2022	0.302
2023	0.274

Total Documents

Evolution of the number of published documents. All types of documents are considered, including citable and non citable documents.

Year	Documents
1999	84
2000	77
2001	90
2002	100
2003	106
2004	159
2005	62
2006	161
2007	106
2008	112
2009	116
2010	93
2011	100
2012	92
2013	74
2014	62
2015	75
2016	58
2017	44
2018	40
2019	58
2020	41
2021	33
2022	36
2023	35

Citations per document

This indicator counts the number of citations received by documents from a journal and divides them by the total number of documents published in that journal. The chart shows the evolution of the average number of times documents published in a journal in the past two, three and four years have been cited in the current year. The two years line is equivalent to journal impact factor ™ (Thomson Reuters) metric.

Cites per document	Year	Value
Cites / Doc. (4 years)	1999	0.596
Cites / Doc. (4 years)	2000	0.591
Cites / Doc. (4 years)	2001	0.546
Cites / Doc. (4 years)	2002	0.352
Cites / Doc. (4 years)	2003	0.396
Cites / Doc. (4 years)	2004	0.670
Cites / Doc. (4 years)	2005	0.477
Cites / Doc. (4 years)	2006	0.588
Cites / Doc. (4 years)	2007	0.600
Cites / Doc. (4 years)	2008	0.566
Cites / Doc. (4 years)	2009	0.610
Cites / Doc. (4 years)	2010	0.614
Cites / Doc. (4 years)	2011	0.717
Cites / Doc. (4 years)	2012	0.679
Cites / Doc. (4 years)	2013	0.636
Cites / Doc. (4 years)	2014	0.727
Cites / Doc. (4 years)	2015	0.750
Cites / Doc. (4 years)	2016	0.653
Cites / Doc. (4 years)	2017	0.532
Cites / Doc. (4 years)	2018	0.623
Cites / Doc. (4 years)	2019	0.507
Cites / Doc. (4 years)	2020	0.595
Cites / Doc. (4 years)	2021	0.852
Cites / Doc. (4 years)	2022	0.890
Cites / Doc. (4 years)	2023	0.893
Cites / Doc. (3 years)	1999	0.596
Cites / Doc. (3 years)	2000	0.562
Cites / Doc. (3 years)	2001	0.614
Cites / Doc. (3 years)	2002	0.343
Cites / Doc. (3 years)	2003	0.453
Cites / Doc. (3 years)	2004	0.709
Cites / Doc. (3 years)	2005	0.468
Cites / Doc. (3 years)	2006	0.563
Cites / Doc. (3 years)	2007	0.597
Cites / Doc. (3 years)	2008	0.632
Cites / Doc. (3 years)	2009	0.615
Cites / Doc. (3 years)	2010	0.620
Cites / Doc. (3 years)	2011	0.707
Cites / Doc. (3 years)	2012	0.693
Cites / Doc. (3 years)	2013	0.730
Cites / Doc. (3 years)	2014	0.741
Cites / Doc. (3 years)	2015	0.803
Cites / Doc. (3 years)	2016	0.744
Cites / Doc. (3 years)	2017	0.538
Cites / Doc. (3 years)	2018	0.633
Cites / Doc. (3 years)	2019	0.507
Cites / Doc. (3 years)	2020	0.613
Cites / Doc. (3 years)	2021	0.856
Cites / Doc. (3 years)	2022	1.000
Cites / Doc. (3 years)	2023	0.836
Cites / Doc. (2 years)	1999	0.609
Cites / Doc. (2 years)	2000	0.536
Cites / Doc. (2 years)	2001	0.491
Cites / Doc. (2 years)	2002	0.431
Cites / Doc. (2 years)	2003	0.442
Cites / Doc. (2 years)	2004	0.699
Cites / Doc. (2 years)	2005	0.442
Cites / Doc. (2 years)	2006	0.584
Cites / Doc. (2 years)	2007	0.601
Cites / Doc. (2 years)	2008	0.637
Cites / Doc. (2 years)	2009	0.651
Cites / Doc. (2 years)	2010	0.601
Cites / Doc. (2 years)	2011	0.785
Cites / Doc. (2 years)	2012	0.803
Cites / Doc. (2 years)	2013	0.750
Cites / Doc. (2 years)	2014	0.765
Cites / Doc. (2 years)	2015	0.897
Cites / Doc. (2 years)	2016	0.686
Cites / Doc. (2 years)	2017	0.579
Cites / Doc. (2 years)	2018	0.735
Cites / Doc. (2 years)	2019	0.607
Cites / Doc. (2 years)	2020	0.531
Cites / Doc. (2 years)	2021	0.879
Cites / Doc. (2 years)	2022	1.027
Cites / Doc. (2 years)	2023	0.913

Total Cites

Self-Cites

Evolution of the total number of citations and journal's self-citations received by a journal's published documents during the three previous years.
Journal Self-citation is defined as the number of citation from a journal citing article to articles published by the same journal.

Cites	Year	Value
Self Cites	1999	22
Self Cites	2000	36
Self Cites	2001	45
Self Cites	2002	31
Self Cites	2003	50
Self Cites	2004	78
Self Cites	2005	42
Self Cites	2006	59
Self Cites	2007	60
Self Cites	2008	70
Self Cites	2009	54
Self Cites	2010	59
Self Cites	2011	54
Self Cites	2012	73
Self Cites	2013	49
Self Cites	2014	65
Self Cites	2015	41
Self Cites	2016	22
Self Cites	2017	20
Self Cites	2018	16
Self Cites	2019	7
Self Cites	2020	6
Self Cites	2021	9
Self Cites	2022	29
Self Cites	2023	9
Total Cites	1999	81
Total Cites	2000	109
Total Cites	2001	140
Total Cites	2002	86
Total Cites	2003	121
Total Cites	2004	210
Total Cites	2005	171
Total Cites	2006	184
Total Cites	2007	228
Total Cites	2008	208
Total Cites	2009	233
Total Cites	2010	207
Total Cites	2011	227
Total Cites	2012	214
Total Cites	2013	208
Total Cites	2014	197
Total Cites	2015	183
Total Cites	2016	157
Total Cites	2017	105
Total Cites	2018	112
Total Cites	2019	72
Total Cites	2020	87
Total Cites	2021	119
Total Cites	2022	132
Total Cites	2023	92

External Cites per Doc

Cites per Doc

Evolution of the number of total citation per document and external citation per document (i.e. journal self-citations removed) received by a journal's published documents during the three previous years. External citations are calculated by subtracting the number of self-citations from the total number of citations received by the journal’s documents.

Cites	Year	Value
External Cites per document	1999	0.434
External Cites per document	2000	0.376
External Cites per document	2001	0.417
External Cites per document	2002	0.219
External Cites per document	2003	0.266
External Cites per document	2004	0.446
External Cites per document	2005	0.353
External Cites per document	2006	0.382
External Cites per document	2007	0.440
External Cites per document	2008	0.419
External Cites per document	2009	0.472
External Cites per document	2010	0.443
External Cites per document	2011	0.539
External Cites per document	2012	0.456
External Cites per document	2013	0.558
External Cites per document	2014	0.496
External Cites per document	2015	0.623
External Cites per document	2016	0.640
External Cites per document	2017	0.436
External Cites per document	2018	0.542
External Cites per document	2019	0.458
External Cites per document	2020	0.570
External Cites per document	2021	0.791
External Cites per document	2022	0.780
External Cites per document	2023	0.755
Cites per document	1999	0.596
Cites per document	2000	0.562
Cites per document	2001	0.614
Cites per document	2002	0.343
Cites per document	2003	0.453
Cites per document	2004	0.709
Cites per document	2005	0.468
Cites per document	2006	0.563
Cites per document	2007	0.597
Cites per document	2008	0.632
Cites per document	2009	0.615
Cites per document	2010	0.620
Cites per document	2011	0.707
Cites per document	2012	0.693
Cites per document	2013	0.730
Cites per document	2014	0.741
Cites per document	2015	0.803
Cites per document	2016	0.744
Cites per document	2017	0.538
Cites per document	2018	0.633
Cites per document	2019	0.507
Cites per document	2020	0.613
Cites per document	2021	0.856
Cites per document	2022	1.000
Cites per document	2023	0.836

% International Collaboration

International Collaboration accounts for the articles that have been produced by researchers from several countries. The chart shows the ratio of a journal's documents signed by researchers from more than one country; that is including more than one country address.

Year	International Collaboration
1999	13.10
2000	11.69
2001	16.67
2002	12.00
2003	13.21
2004	15.09
2005	11.29
2006	15.53
2007	18.87
2008	13.39
2009	17.24
2010	17.20
2011	21.00
2012	13.04
2013	20.27
2014	16.13
2015	16.00
2016	20.69
2017	15.91
2018	17.50
2019	18.97
2020	17.07
2021	18.18
2022	25.00
2023	11.43

Citable documents

Non-citable documents

Not every article in a journal is considered primary research and therefore "citable", this chart shows the ratio of a journal's articles including substantial research (research articles, conference papers and reviews) in three year windows vs. those documents other than research articles, reviews and conference papers.

Documents	Year	Value
Non-citable documents	1999	0
Non-citable documents	2000	0
Non-citable documents	2001	0
Non-citable documents	2002	0
Non-citable documents	2003	12
Non-citable documents	2004	22
Non-citable documents	2005	34
Non-citable documents	2006	28
Non-citable documents	2007	34
Non-citable documents	2008	36
Non-citable documents	2009	44
Non-citable documents	2010	46
Non-citable documents	2011	45
Non-citable documents	2012	55
Non-citable documents	2013	53
Non-citable documents	2014	48
Non-citable documents	2015	30
Non-citable documents	2016	18
Non-citable documents	2017	14
Non-citable documents	2018	10
Non-citable documents	2019	8
Non-citable documents	2020	5
Non-citable documents	2021	6
Non-citable documents	2022	4
Non-citable documents	2023	3
Citable documents	1999	136
Citable documents	2000	194
Citable documents	2001	228
Citable documents	2002	251
Citable documents	2003	255
Citable documents	2004	274
Citable documents	2005	331
Citable documents	2006	299
Citable documents	2007	348
Citable documents	2008	293
Citable documents	2009	335
Citable documents	2010	288
Citable documents	2011	276
Citable documents	2012	254
Citable documents	2013	232
Citable documents	2014	218
Citable documents	2015	198
Citable documents	2016	193
Citable documents	2017	181
Citable documents	2018	167
Citable documents	2019	134
Citable documents	2020	137
Citable documents	2021	133
Citable documents	2022	128
Citable documents	2023	107

Cited documents

Uncited documents

Ratio of a journal's items, grouped in three years windows, that have been cited at least once vs. those not cited during the following year.

Documents	Year	Value
Uncited documents	1999	89
Uncited documents	2000	137
Uncited documents	2001	158
Uncited documents	2002	198
Uncited documents	2003	190
Uncited documents	2004	193
Uncited documents	2005	256
Uncited documents	2006	213
Uncited documents	2007	243
Uncited documents	2008	205
Uncited documents	2009	239
Uncited documents	2010	203
Uncited documents	2011	195
Uncited documents	2012	181
Uncited documents	2013	173
Uncited documents	2014	163
Uncited documents	2015	131
Uncited documents	2016	123
Uncited documents	2017	130
Uncited documents	2018	106
Uncited documents	2019	95
Uncited documents	2020	89
Uncited documents	2021	73
Uncited documents	2022	59
Uncited documents	2023	66
Cited documents	1999	47
Cited documents	2000	57
Cited documents	2001	70
Cited documents	2002	53
Cited documents	2003	77
Cited documents	2004	103
Cited documents	2005	109
Cited documents	2006	114
Cited documents	2007	139
Cited documents	2008	124
Cited documents	2009	140
Cited documents	2010	131
Cited documents	2011	126
Cited documents	2012	128
Cited documents	2013	112
Cited documents	2014	103
Cited documents	2015	97
Cited documents	2016	88
Cited documents	2017	65
Cited documents	2018	71
Cited documents	2019	47
Cited documents	2020	53
Cited documents	2021	66
Cited documents	2022	73
Cited documents	2023	44