{"id":364686,"date":"2024-10-20T01:51:40","date_gmt":"2024-10-20T01:51:40","guid":{"rendered":"https:\/\/pdfstandards.shop\/product\/uncategorized\/bsi-21-30429402-dc\/"},"modified":"2024-10-26T02:58:29","modified_gmt":"2024-10-26T02:58:29","slug":"bsi-21-30429402-dc","status":"publish","type":"product","link":"https:\/\/pdfstandards.shop\/product\/publishers\/bsi\/bsi-21-30429402-dc\/","title":{"rendered":"BSI 21\/30429402 DC"},"content":{"rendered":"

This document specifies a method for the determination of the silanol group content on the surface of fumed silica by reaction gas chromatographic method.<\/p>\n

PDF Catalog<\/h4>\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
7<\/td>\nForeword <\/td>\n<\/tr>\n
8<\/td>\nIntroduction <\/td>\n<\/tr>\n
9<\/td>\n1 Scope
2 Normative references
3 Terms and definitions
4 Principle <\/td>\n<\/tr>\n
10<\/td>\n5 Reagents
5.1 General
5.2 Toluene
5.3 Grignard reagent
5.4 Reaction solution
5.5 Carrier gas and diluent gas
5.6 Auxiliary gases
5.7 Calibration substance <\/td>\n<\/tr>\n
11<\/td>\n6 Apparatus
6.1 Gas chromatograph
6.2 Headspace system
6.3 Oven
6.4 Capillary column
6.5 Sample vials <\/td>\n<\/tr>\n
12<\/td>\n6.6 Analytical balance
6.7 Gas collecting bag
6.8 Syringe
7 Sample pre-treatment and reaction
7.1 Sample pre-treatment
7.1.1 Determination of matter volatile at 105\u00a0\u00b0C in fumed silica
7.1.2 Preparation of the test sample
7.2 Blank test <\/td>\n<\/tr>\n
13<\/td>\n7.3 Reaction
7.4 Analysis
7.4.1 Headspace system conditions
7.4.2 Gas chromatographic conditions
7.4.3 Identification
7.4.4 Calibration <\/td>\n<\/tr>\n
14<\/td>\n7.4.5 Measurement
8 Calculation
8.1 Calculation of the methane quantity produced in the vials
8.2 Calculation of the silanol group content
8.2.1 Calculation of fumed silica volatile at 105\u00a0\u00b0C <\/td>\n<\/tr>\n
15<\/td>\n8.2.2 Calculation of the silanol group content on the surface of fumed silica
9 Expression of results
10 Precision
10.1 General
10.2 Repeatability limit, r
10.3 Reproducibility limit, R <\/td>\n<\/tr>\n
16<\/td>\n11 Test report <\/td>\n<\/tr>\n
17<\/td>\nAnnex\u00a0A (informative) Representative chromatogram of methane <\/td>\n<\/tr>\n
18<\/td>\nAnnex\u00a0B (informative) Information about precision <\/td>\n<\/tr>\n
19<\/td>\nBibliography <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":"

BS ISO 23157. Determination of the silanol group content on the surface of fumed silica. Reaction gas chromatographic method<\/b><\/p>\n\n\n\n\n
Published By<\/td>\nPublication Date<\/td>\nNumber of Pages<\/td>\n<\/tr>\n
BSI<\/b><\/a><\/td>\n2021<\/td>\n19<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":364694,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[1214,2641],"product_tag":[],"class_list":{"0":"post-364686","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-87-060-10","7":"product_cat-bsi","9":"first","10":"instock","11":"sold-individually","12":"shipping-taxable","13":"purchasable","14":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product\/364686","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\/364694"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=364686"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=364686"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=364686"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}