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Significance and Use
5.1 Silver may be used to treat consumer textile products to provide enhanced antimicrobial (fungi, bacteria, viruses) properties (. At any point in a textile product’s lifecycle, there may be a need to measure the amount of silver present. This standard prescribes a test method based on ICP-OES or ICP-MS analysis that manufacturers, producers, analysts, policymakers, regulators, and others may use for measurement of total silver in textiles. As described in Guide , ) , determination of total silver in a consumer textile product is one component of a tiered approach to determine if silver is present, possibly as nanomaterial(s) (one or more external dimensions in the nanoscale), prior to measuring the form and dimension of the Ag that is found. ICP-OES or ICP-MS analysis alone is not sufficient to determine whether a textile contains silver nanomaterial(s).
Note 4: There are many different chemical and physical forms of silver that are used to treat textiles and an overview of this topic is provided in Guide .
5.2 As described in Guide , the amount of silver in a textile can decrease over time as silver metal and silver compounds can react with oxygen and other oxidation-reduction (redox) active agents present in the environment to form soluble ionic species which are released by contact with moisture (for example, from ambient humidity, washing, body sweat, rain, or other sources). Hence, if silver is measured in a textile, the result may only be indicative of that moment in the article’s life cycle and great care is necessary in drawing temporal inferences from the results.
5.3 If silver is measured by ICP-OES or ICP-MS analysis, additional analyses are needed to elucidate the form of silver in the textile specimen. This step is necessary because ICP-OES or ICP-MS results are for total silver independent of chemical and physical form and textiles may be treated with silver in sizes that range from the nanoscale (for example, salt nanoparticles) to the micrometer scale (for example, particulates or fibers).
5.4 If no silver is detected by ICP-OES, the more sensitive ICP-MS should be used to determine if silver is present in a test specimen. If no silver is detected in a textile sample using appropriate (fit for purpose) analytical techniques, then testing can be terminated.
Note 5: Typical method detection limits are 0.6 µg Ag/L by ICP-OES and 0.002 µg Ag/L by ICP-MS which are comparable to limits successfully used to detect silver in a range of products, including sports textiles and wound dressings (. )
5.5 Results of ICP-OES or ICP-MS analysis may be qualitative or quantitative, depending upon the efficacy of the digestion procedure for the textile matrix. Regardless, ICP-OES or ICP-MS analysis is recommended as a first step to screen for the presence of silver in a textile and results can be used to inform subsequent more detailed analyses as part of a tiered approach to determine if a textile contains silver nanomaterial(s).
1.1 This test method covers the use of inductively coupled plasma–optical emission spectrometry (ICP-OES) and inductively coupled plasma–mass spectrometry (ICP-MS) analyses for determination of the mass fraction of total silver in consumer textile products made of any combination of natural or manufactured fibers. Either ICP-OES or ICP-MS analysis is recommended as a first step to test for and quantify silver in a textile and results can be used to inform subsequent, more detailed analyses as part of the tiered approach described in Guide to determine if a textile contains silver nanomaterial(s).
1.2 This test method prescribes acid digestion to prepare test sample solutions from samples of textiles utilizing an appropriate internal standard followed by external calibration and analysis with either ICP-OES or ICP-MS to quantify total silver.
1.3 This test method is believed to provide quantitative results for textiles made of fibers of rayon, cotton, polyester, and lycra that contain metallic silver (see Section ). It is the analyst’s responsibility to establish the efficacy (ability to achieve the planned and desired analytical result) of this test method for other textile matrices and forms of silver.
1.4 Units—The values stated in SI units are to be regarded as standard. No other units of measurements are included in this standard.
1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
C1614 Practice for the Determination of 237Np, 232Th, 235U, and 238U in Urine by Inductively Coupled Plasma-Mass Spectrometry (ICP-MS) and Gamma Ray Spectrometry
C1625 Test Method for Uranium and Plutonium Concentrations and Isotopic Abundances by Thermal Ionization Mass Spectrometry
D123 Terminology Relating to Textiles
D1193 Specification for Reagent Water
D4210 Practice for Intralaboratory Quality Control Procedures and a Discussion on Reporting Low-Level Data
D6413 Test Method for Flame Resistance of Textiles (Vertical Test)
D7035 Test Method for Determination of Metals and Metalloids in Airborne Particulate Matter by Inductively Coupled Plasma Atomic Emission Spectrometry (ICP-AES)
D7439 Test Method for Determination of Elements in Airborne Particulate Matter by Inductively Coupled PlasmaMass Spectrometry
E288 Specification for Laboratory Glass Volumetric Flasks
E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
E694 Specification for Laboratory Glass Volumetric Apparatus
E1613 Test Method for Determination of Lead by Inductively Coupled Plasma Atomic Emission Spectrometry (ICP-AES), Flame Atomic Absorption Spectrometry (FAAS), or Graphite Furnace Atomic Absorption Spectrometry (GFAAS) Techniques
E2456 Terminology Relating to Nanotechnology
E3025 Guide for Tiered Approach to Detection and Characterization of Silver Nanomaterials in Textiles
AATCC StandardsAATCC 135 Dimensional Changes of Fabrics after Home Laundering
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ASTM E3171-21a, Standard Test Method for Determination of Total Silver in Textiles by ICP-OES or ICP-MS Analysis, ASTM International, West Conshohocken, PA, 2021, www.astm.orgBack to Top