{"id":305764,"date":"2024-10-19T20:56:05","date_gmt":"2024-10-19T20:56:05","guid":{"rendered":"https:\/\/pdfstandards.shop\/product\/uncategorized\/bs-iso-214002018\/"},"modified":"2024-10-25T18:30:55","modified_gmt":"2024-10-25T18:30:55","slug":"bs-iso-214002018","status":"publish","type":"product","link":"https:\/\/pdfstandards.shop\/product\/publishers\/bsi\/bs-iso-214002018\/","title":{"rendered":"BS ISO 21400:2018"},"content":{"rendered":"

This document specifies procedures for the laboratory determination of the total elemental sulfur and the sulfate half-ester content of cellulose nanocrystals (CNCs) by inductively coupled plasma-optical emission spectroscopy and conductometric titration, respectively, including sample preparation, measurement methods and data analysis.<\/p>\n

This document is applicable to the characterization of CNCs:<\/p>\n

    \n
  1. \n

    with all monovalent counterions (particularly hydronium and sodium cations);<\/p>\n<\/li>\n

  2. \n

    which are either in the never-dried state in aqueous suspension, or have been redispersed from a dried form; and<\/p>\n<\/li>\n

  3. \n

    which have been extracted from any naturally occurring cellulose source using a range of sulfuric acid hydrolysis conditions, or have been sulfated post-hydrolysis using sulfuric acid.<\/p>\n<\/li>\n<\/ol>\n

    PDF Catalog<\/h4>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
    PDF Pages<\/th>\nPDF Title<\/th>\n<\/tr>\n
    2<\/td>\nNational foreword <\/td>\n<\/tr>\n
    6<\/td>\nForeword <\/td>\n<\/tr>\n
    7<\/td>\nIntroduction <\/td>\n<\/tr>\n
    9<\/td>\n1 Scope
    2 Normative references
    3 Terms and definitions <\/td>\n<\/tr>\n
    11<\/td>\n4 Symbols and abbreviated terms <\/td>\n<\/tr>\n
    12<\/td>\n5 Total elemental sulfur content \u2014 ICP-OES method
    5.1 Principle <\/td>\n<\/tr>\n
    13<\/td>\n5.2 Reagents and apparatus <\/td>\n<\/tr>\n
    14<\/td>\n5.3 Sample purification by dialysis <\/td>\n<\/tr>\n
    16<\/td>\n5.4 Microwave-assisted sample digestion and sample preparation <\/td>\n<\/tr>\n
    18<\/td>\n5.5 Preparation of calibration solutions and blanks <\/td>\n<\/tr>\n
    19<\/td>\n5.6 Analysis of standards and samples by ICP-OES <\/td>\n<\/tr>\n
    20<\/td>\n5.7 Calculation of dry CNC total elemental sulfur content and CNC surface charge <\/td>\n<\/tr>\n
    21<\/td>\n5.8 Test report
    6 Sulfate half-ester content \u2014 Conductometric titration method
    6.1 Principle
    6.2 Reagents and apparatus <\/td>\n<\/tr>\n
    23<\/td>\n6.3 Sample purification by dialysis <\/td>\n<\/tr>\n
    24<\/td>\n6.4 Sample protonation by ion exchange <\/td>\n<\/tr>\n
    25<\/td>\n6.5 Sample analysis by conductometric titration <\/td>\n<\/tr>\n
    26<\/td>\n6.6 Calculation of dry CNC sulfate half-ester content and CNC surface charge <\/td>\n<\/tr>\n
    28<\/td>\n6.7 Test report <\/td>\n<\/tr>\n
    29<\/td>\nAnnex A (normative) Sample digestion by wet ashing <\/td>\n<\/tr>\n
    31<\/td>\nAnnex B (normative) Sample protonation by batch treatment with ion exchange resin <\/td>\n<\/tr>\n
    32<\/td>\nAnnex C (informative) Precision <\/td>\n<\/tr>\n
    34<\/td>\nBibliography <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":"

    Pulp. Determination of cellulose nanocrystal sulfur and sulfate half-ester content<\/b><\/p>\n\n\n\n\n
    Published By<\/td>\nPublication Date<\/td>\nNumber of Pages<\/td>\n<\/tr>\n
    BSI<\/b><\/a><\/td>\n2019<\/td>\n36<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":305769,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[2641],"product_tag":[],"class_list":{"0":"post-305764","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-bsi","8":"first","9":"instock","10":"sold-individually","11":"shipping-taxable","12":"purchasable","13":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product\/305764","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media\/305769"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=305764"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=305764"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=305764"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}