{"id":17514,"date":"2024-06-18T14:03:39","date_gmt":"2024-06-18T12:03:39","guid":{"rendered":"https:\/\/www.vsl.nl\/reference-material-of-nitrogen-dioxide-in-nitrogen-prm-no2\/"},"modified":"2024-09-25T13:28:03","modified_gmt":"2024-09-25T11:28:03","slug":"certificate-of-prm-2","status":"publish","type":"page","link":"https:\/\/www.vsl.nl\/en\/about-vsl\/certificates\/certificate-of-prm-2\/","title":{"rendered":"Certificate of PRM 2"},"content":{"rendered":"

[vc_section full_width=”stretch_row” content_placement=”middle” css=”.vc_custom_1668958376190{background-image: url(https:\/\/www.vsl.nl\/wp-content\/uploads\/2022\/11\/Lab-Foto-WEB-32.jpg?id=2224) !important;background-position: center !important;background-repeat: no-repeat !important;background-size: cover !important;}” el_class=”main_header gradient_header dg-position-realtive”][vc_row equal_height=”yes” content_placement=”middle” el_class=”dg-header–small”][vc_column width=”2\/3″ el_class=”dg-padding-none”][vc_column_text css=”.vc_custom_1727263673280{margin-bottom: 0px !important;padding-bottom: 0px !important;}” el_class=”text-white dg-script”]<\/p>\n

Certificate of PRM 2<\/h1>\n

Here you will find an explanation about a VSL certificate issued for primary reference materials.[\/vc_column_text][\/vc_column][vc_column width=”1\/3″][\/vc_column][\/vc_row][\/vc_section][vc_section el_class=”dg-padding-none dg-certificate–page”][vc_row][vc_column width=”3\/4″][vc_raw_js]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[\/vc_raw_js][\/vc_column][vc_column width=”1\/4″ el_id=”number-row”][vc_column_text css=”.vc_custom_1718717427160{margin-bottom: 0px !important;padding-bottom: 0px !important;}” el_class=”dg-certificate–header”]<\/p>\n

CERTIFICATE<\/h3>\n

Number C2345601.02
\nPage 1 of 4[\/vc_column_text][\/vc_column][\/vc_row][vc_row el_class=”dg-certificate–row”][vc_column width=”1\/6″][vc_btn title=”” align=”left” i_icon_fontawesome=”fas fa-info” css=”.vc_custom_1710862192107{margin-bottom: 0px !important;}” add_icon=”true” el_class=”dg-info–button dg-certificate–text first-button” el_id=”title”][\/vc_column][vc_column width=”5\/6″ el_id=”title-row” el_class=”dg-certificate–column”][vc_column_text css=”.vc_custom_1718714925187{margin-bottom: 0px !important;}” el_id=”title”]Reference material of nitrogen dioxide in nitrogen<\/strong>[\/vc_column_text][vc_column_text el_class=”dg-certificate–information” el_id=”title-info”]The title contains the mixture type (reference material), the components and the matrix gas.[\/vc_column_text][\/vc_column][\/vc_row][vc_row el_class=”dg-certificate–row”][vc_column width=”1\/6″][vc_column_text css=”.vc_custom_1710862175541{margin-bottom: 0px !important;}”]Description[\/vc_column_text][vc_btn title=”” align=”left” i_icon_fontawesome=”fas fa-info” css=”.vc_custom_1710862181806{margin-bottom: 0px !important;}” add_icon=”true” el_class=”dg-info–button dg-certificate–text” el_id=”description”][\/vc_column][vc_column width=”5\/6″ el_id=”description-row” el_class=”dg-certificate–column”][vc_column_text css=”.vc_custom_1722505697295{margin-bottom: 0px !important;}”]Primary reference gas mixture (PRM), cylinder number D123456.
\nThe cylinder contains a mixture of nitrogen dioxide in nitrogen.
\nThe PRM is contained in a passivated aluminium cylinder. The cylinder has a water
\nvolume of 5 L and is pressurized to 12.5 MPa.
\nCylinder outlet conforms to DIN 1 specifications.[\/vc_column_text][vc_column_text el_class=”dg-certificate–information” el_id=”description-info”]This section contains a description of the cylinder and the provided mixture. For primary reference gas mixtures, the result is the gravimetrically determined value, while for certified reference gas mixtures, the result is the analytically determined value. The cylinder number is identical to the number that is stamped into the wall of the cylinder, and this is the only connection between the certificate and the gas cylinder. The contents of the cylinder are mentioned, followed by the type of cylinder together with the volume and the gas pressure. Finally, the valve outlet type of the cylinder is specified.[\/vc_column_text][\/vc_column][\/vc_row][vc_row el_class=”dg-certificate–row”][vc_column width=”1\/6″][vc_column_text css=”.vc_custom_1710857271787{margin-bottom: 0px !important;}”]Method[\/vc_column_text][vc_btn title=”” align=”left” i_icon_fontawesome=”fas fa-info” css=”.vc_custom_1710862145537{margin-bottom: 0px !important;}” add_icon=”true” el_class=”dg-info–button dg-certificate–text” el_id=”method”][\/vc_column][vc_column width=”5\/6″ el_class=”dg-certificate–column” el_id=”method-row”][vc_column_text css=”.vc_custom_1718712065646{margin-bottom: 0px !important;}”]Gravimetric preparation in accordance with ISO 6142-1:2015. For further information, see \u201cCommutability\u201d and \u201cAdditional information”[\/vc_column_text][vc_column_text el_class=”dg-certificate–information” el_id=”method-info”]Our primary reference gas mixtures are prepared gravimetrically in accordance with ISO 6142-1:2015. With this preparation method, we can offer mixtures with traceable values for the amount fraction of the requested component(s) together with their guaranteed stability and uncertainty. The method used for the verification of the mixture against VSL\u2019s primary standards is also specified.<\/p>\n

For certified reference gas mixtures, the method(s) used to attribute the result of the composition is mentioned.[\/vc_column_text][\/vc_column][\/vc_row][vc_row el_class=”dg-certificate–row”][vc_column width=”1\/6″][vc_column_text css=”.vc_custom_1710857276461{margin-bottom: 0px !important;}”]Result[\/vc_column_text][vc_btn title=”” align=”left” i_icon_fontawesome=”fas fa-info” css=”.vc_custom_1710861720019{margin-bottom: 0px !important;}” add_icon=”true” el_class=”dg-info–button dg-certificate–text” el_id=”result”][\/vc_column][vc_column width=”5\/6″ el_id=”result-row” el_class=”dg-certificate–column”][vc_column_text css=”.vc_custom_1722505668207{margin-bottom: 0px !important;}” el_class=”dg-certificate–table”]The results are presented on page 2.
\nThe reported uncertainty of measurement is based on the standard uncertainty multiplied by a coverage factor k<\/em> = 2, which for a normal distribution corresponds to a coverage probability of approximately 95 %. The standard uncertainty has been determined in accordance with the GUM \u2018Evaluation of measurement data – Guide to the Expression of Uncertainty in Measurement\u2019[\/vc_column_text][vc_column_text css=”” el_class=”dg-certificate–information” el_id=”result-info”]The amount fraction of each component with its uncertainty is listed here or on a separate page. The section below gives a description of the stated measurement uncertainty. All contributing factors to the uncertainty, such as the purity of the raw materials, the weighing process and verification of the prepared mixture are combined into the standard uncertainty in accordance with GUM \u2018Evaluation of measurement data – Guide to the Expression of Uncertainty in Measurement\u2019. The measurement uncertainty is provided as an expanded uncertainty.[\/vc_column_text][\/vc_column][\/vc_row][vc_row el_class=”dg-certificate–row”][vc_column width=”1\/6″][vc_column_text css=”.vc_custom_1710862037150{margin-bottom: 0px !important;}”]Traceability[\/vc_column_text][vc_btn title=”” align=”left” i_icon_fontawesome=”fas fa-info” css=”.vc_custom_1710861731654{margin-bottom: 0px !important;}” add_icon=”true” el_class=”dg-info–button dg-certificate–text” el_id=”traceability”][\/vc_column][vc_column width=”5\/6″ el_id=”traceability-row” el_class=”dg-certificate–column”][vc_column_text css=”.vc_custom_1718712135051{margin-bottom: 0px !important;}”]The results on this certificate are traceable to VSL Primary Standards.[\/vc_column_text][vc_column_text el_class=”dg-certificate–information” el_id=”traceability-info”]The results on this certificate are traceable to VSL Primary Standards. This means that the result is related (traceable) to VSL\u2019s reference standards. More information is given on the final page. As stated in ISO 6142-1:2015, the metrological traceability of Class I calibration gas mixtures arises from correct determination of the masses added, conversion of the masses to the amounts of substance (taking into account the purity) and verification against independent measurement standards.[\/vc_column_text][\/vc_column][\/vc_row][vc_row el_class=”dg-certificate–row”][vc_column width=”1\/6″][vc_column_text css=”.vc_custom_1710862031207{margin-bottom: 0px !important;}”]Safety information[\/vc_column_text][vc_btn title=”” align=”left” i_icon_fontawesome=”fas fa-info” css=”.vc_custom_1710861850215{margin-bottom: 0px !important;}” add_icon=”true” el_class=”dg-info–button dg-certificate–text” el_id=”safety”][\/vc_column][vc_column width=”5\/6″ el_id=”safety-row” el_class=”dg-certificate–column”][vc_column_text css=”.vc_custom_1722505632954{margin-bottom: 0px !important;}”]The cylinder should be handled with care and by experienced personnel in a laboratory environment suitably equipped for the safe handling of gaseous materials.[\/vc_column_text][vc_column_text css=”” el_class=”dg-certificate–information” el_id=”safety-info”]The cylinder is a pressure container containing the requested gas at high pressure and should therefore be used with care. Besides, the filling may be a hazardous material.[\/vc_column_text][\/vc_column][\/vc_row][vc_row el_class=”dg-certificate–row”][vc_column width=”1\/6″][vc_column_text css=”.vc_custom_1710862020145{margin-bottom: 0px !important;}”]Instructions for use[\/vc_column_text][vc_btn title=”” align=”left” i_icon_fontawesome=”fas fa-info” css=”.vc_custom_1710861742109{margin-bottom: 0px !important;}” add_icon=”true” el_class=”dg-info–button dg-certificate–text” el_id=”instructions”][\/vc_column][vc_column width=”5\/6″ el_id=”instructions-row” el_class=”dg-certificate–column”][vc_column_text css=”.vc_custom_1722505603359{margin-bottom: 0px !important;}” el_class=”dg-script”]The gas mixture can be used to validate and\/or calibrate analytical methods and equipment. As a guideline, the NOx<\/strong> value can be used as representative value for the calibration of NO2<\/strong> using a non-specific NOx<\/strong> detector such as a chemiluminescence detector with a Molybdenum convertor. The specified NO2<\/strong> value is representative with the use of a detector that discriminates between the different NOx<\/strong> species, such as e.g. spectroscopic measurement techniques. Do not use the cylinder in case the cylinder pressure is below 1 MPa. Further instructions regarding the handling of calibration gases can be found in ISO 16664:2017[\/vc_column_text][vc_column_text el_class=”dg-certificate–information” el_id=”instructions-info”]This section contains specific information on the intended use of the cylinder.[\/vc_column_text][\/vc_column][\/vc_row][vc_row el_class=”dg-certificate–row”][vc_column width=”1\/6″][vc_column_text css=”.vc_custom_1710857465627{margin-bottom: 0px !important;}”]Expiry date[\/vc_column_text][vc_btn title=”” align=”left” i_icon_fontawesome=”fas fa-info” css=”.vc_custom_1710861761264{margin-bottom: 0px !important;}” add_icon=”true” el_class=”dg-info–button dg-certificate–text” el_id=”expiry”][\/vc_column][vc_column width=”5\/6″ el_id=”expiry-row” el_class=”dg-certificate–column”][vc_column_text css=”.vc_custom_1722505541838{margin-bottom: 0px !important;}”]This certificate\u00a0is valid until 12 September 2024. After this date, the results stated
\nare no longer guaranteed to be valid.[\/vc_column_text][vc_column_text el_class=”dg-certificate–information” el_id=”expiry-info”]The expiry date is the date until when VSL can guarantee the result of the measurement. After this date, the result is no longer guaranteed. When the certificate is expired, contact our Sales department for advice on how to treat the gas mixture.[\/vc_column_text][\/vc_column][\/vc_row][vc_row el_class=”dg-certificate–row”][vc_column width=”1\/6″][vc_btn title=”” align=”left” i_icon_fontawesome=”fas fa-info” css=”.vc_custom_1710862284323{margin-bottom: 0px !important;}” add_icon=”true” el_class=”dg-info–button dg-certificate–text first-button” el_id=”signature”][\/vc_column][vc_column width=”5\/6″ el_id=”signature-row” el_class=”dg-certificate–column”][vc_column_text css=”.vc_custom_1718712943997{margin-bottom: 0px !important;}”]Delft, 24 September 2023<\/p>\n

On behalf of VSL,
\nThe Certificate Committee[\/vc_column_text][vc_column_text el_class=”dg-certificate–information” el_id=”signature-info”]All certificates contain an electronic signature to ensure authenticity. The signature is an electronic seal on the document that prohibits making alterations. Any alteration breaks this seal and is shown in the document. More information about the electronic signature can be found here<\/a>.[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column width=”1\/3″][vc_column_text el_class=”dg-certificate–footer”]VSL B.V.<\/strong>
\nThijsseweg 11, 2629 JA Delft (NL)
\nT +31152691500
\nI www.vsl.nl[\/vc_column_text][\/vc_column][vc_column width=”1\/3″][vc_column_text el_class=”dg-certificate–footer”]This certificate is electronically signed and
\nsealed. This can be verified on
\nwww.vsl.nl\/en\/digital-certificates<\/a><\/p>\n

The measurement results presented in this
\ncertificate only relate to the standard(s) as
\ndescribed in this certificate.[\/vc_column_text][\/vc_column][vc_column width=”1\/3″][vc_column_text el_class=”dg-certificate–footer”]This certificate is issued under the provision that no liability is accepted, and that the applicant gives warranty for each responsibility against third parties.<\/p>\n

This document may be freely distributed, but always in its entirety.[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column width=”1\/3″][\/vc_column][vc_column width=”1\/3″][\/vc_column][vc_column width=”1\/3″][vc_column_text el_class=”dg-certificate–footer-version”]version 28[\/vc_column_text][\/vc_column][\/vc_row][\/vc_section][vc_section el_class=”dg-padding-none dg-certificate–page”][vc_row][vc_column][vc_row_inner][vc_column_inner width=”3\/4″][vc_btn title=”” align=”left” i_icon_fontawesome=”fas fa-info” css=”.vc_custom_1723033033918{margin-bottom: 0px !important;}” add_icon=”true” el_class=”dg-info–button dg-certificate–text” el_id=”extra-results”][\/vc_column_inner][vc_column_inner width=”1\/4″][vc_column_text css=”.vc_custom_1718713577372{margin-bottom: 0px !important;padding-bottom: 0px !important;}” el_class=”dg-certificate–header”]<\/p>\n

CERTIFICATE<\/h3>\n

Number C2345601.02
\nPage 2 of 4[\/vc_column_text][\/vc_column_inner][\/vc_row_inner][\/vc_column][\/vc_row][vc_row el_class=”dg-certificate–row”][vc_column el_id=”extra-results-row” el_class=”dg-certificate–column”][vc_row_inner][vc_column_inner width=”1\/4″][\/vc_column_inner][vc_column_inner width=”3\/4″][vc_column_text css=”.vc_custom_1718713586526{margin-bottom: 0px !important;}”]Reference material of nitrogen dioxide in nitrogen<\/strong>[\/vc_column_text][\/vc_column_inner][\/vc_row_inner][vc_row_inner][vc_column_inner width=”1\/4″][vc_column_text css=”.vc_custom_1712582439777{margin-bottom: 0px !important;}”]Cylinder Result[\/vc_column_text][\/vc_column_inner][vc_column_inner width=”3\/4″][vc_column_text css=”.vc_custom_1718713797071{margin-bottom: 0px !important;}” el_class=”dg-certificate–table”]D123456<\/p>\n\n\n\n\n
Component<\/strong><\/td>\nAmount fraction <\/strong>
\n[mol\/mol]<\/strong><\/td>\n		Uncertainty <\/strong>
\n[mol\/mol]<\/strong><\/td>\n<\/tr>\n
NOx<\/span> *
\nNO2<\/span><\/td>\n		52.7 \u00d7 10-6<\/span>
\n52.1 x 10-6<\/span><\/td>\n		0.6 \u00d7 10-6<\/span>
\n0.6 \u00d7 10-6<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

[\/vc_column_text][\/vc_column_inner][\/vc_row_inner][vc_row_inner][vc_column_inner width=”1\/4″][vc_column_text css=”.vc_custom_1718714969635{margin-bottom: 0px !important;}”]Commutability[\/vc_column_text][\/vc_column_inner][vc_column_inner width=”3\/4″][vc_column_text css=”.vc_custom_1722505914062{margin-bottom: 0px !important;}” el_class=”dg-certificate–table dg-script”]* Mixtures containing NO2<\/strong> are known to contain an amount of N2<\/strong>O4<\/strong>, due to the equilibrium of the dimerization reaction, which is a function of the amount fraction NO2<\/strong>, pressure and temperature. Also, traces of HNO3 may occur as an
\nimpurity. The reported NOx<\/strong> amount fraction is based on the gravimetric results of the mixture preparation.[\/vc_column_text][\/vc_column_inner][\/vc_row_inner][vc_row_inner][vc_column_inner width=”1\/4″][vc_column_text css=”.vc_custom_1718715294008{margin-bottom: 0px !important;}”]Additional information[\/vc_column_text][\/vc_column_inner][vc_column_inner width=”3\/4″][vc_column_text css=”.vc_custom_1722505919417{margin-bottom: 0px !important;}” el_class=”dg-certificate–table hidden-table dg-script”]The mixture is known to contain the following amount fractions:<\/p>\n\n\n\n\n\n
O2<\/span><\/td>\n1000 \u00d7 10-6<\/span><\/td>\n<\/tr>\n
HNO3<\/span><\/td>\n0.5 \u00d7 10-6<\/span><\/td>\n<\/tr>\n
N2<\/span>O4<\/span><\/td>\n0.04 \u00d7 10-6<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

N2<\/strong>O4<\/strong> is calculated @ 101.325 kPa and 293.15 K; Ref: Hurtmans, D., Herman, M., & Vander Auwera, J. (1993). Integrated band intensities in N2<\/strong>O4<\/strong> in the infrared range. Journal of Quantitative Spectroscopy and Radiative Transfer, 50(6), 595-602.[\/vc_column_text][\/vc_column_inner][\/vc_row_inner][vc_column_text css=”” el_class=”dg-certificate–information dg-script” el_id=”extra-results-info”]For NO2<\/strong> mixtures, an NOx<\/strong> value can be found in the results table. NO2<\/strong> undergoes a dimerization reaction with N2<\/strong>O4<\/strong>, which is in equilibrium. Therefore, NO2<\/strong> mixtures always contain a small fraction of N2<\/strong>O4<\/strong>. HNO3<\/strong> is a second impurity of which trace amounts are found in NO2<\/strong> mixtures. The reported NOx<\/strong> result consists of the results of these three components. Furthermore, for NO2<\/strong> mixtures in nitrogen, approximately 1000 \u00b5mol mol-1 of oxygen is added in excess during preparation[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column][vc_empty_space height=”75vh”][\/vc_column][\/vc_row][\/vc_section]<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"

Here you will find an explanation about a VSL certificate issued for primary reference materials.<\/p>\n","protected":false},"author":2,"featured_media":0,"parent":17752,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":"","_links_to":"","_links_to_target":""},"categories":[93],"tags":[],"class_list":["post-17514","page","type-page","status-publish","hentry","category-certificate","description-off"],"acf":[],"yoast_head":"\nCertificate of PRM 2 - VSL<\/title>\n<meta name=\"robots\" content=\"noindex, nofollow\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Certificate of PRM 2 - VSL\" \/>\n<meta property=\"og:description\" content=\"Here you will find an explanation about a VSL certificate issued for primary reference materials.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.vsl.nl\/en\/about-vsl\/certificates\/certificate-of-prm-2\/\" \/>\n<meta property=\"og:site_name\" content=\"VSL\" \/>\n<meta property=\"article:modified_time\" content=\"2024-09-25T11:28:03+00:00\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"8 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.vsl.nl\/en\/about-vsl\/certificates\/certificate-of-prm-2\/\",\"url\":\"https:\/\/www.vsl.nl\/en\/about-vsl\/certificates\/certificate-of-prm-2\/\",\"name\":\"Certificate of PRM 2 - 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