{"id":317717,"date":"2024-10-19T21:55:54","date_gmt":"2024-10-19T21:55:54","guid":{"rendered":"https:\/\/pdfstandards.shop\/product\/uncategorized\/bs-en-iso-21068-32008\/"},"modified":"2024-10-25T20:12:00","modified_gmt":"2024-10-25T20:12:00","slug":"bs-en-iso-21068-32008","status":"publish","type":"product","link":"https:\/\/pdfstandards.shop\/product\/publishers\/bsi\/bs-en-iso-21068-32008\/","title":{"rendered":"BS EN ISO 21068-3:2008"},"content":{"rendered":"

This part of ISO 21068 specifies methods for the determination of total nitrogen and nitrogen calculated as silicon nitride, total oxygen, and free metallic and oxidic components in silicon carbide raw materials and refractory products.<\/p>\n

It applies only to silicon carbide materials that are not bonded with nitrogen. Nitride-bonded silicon carbide refractories are covered in EN 12698-1.<\/p>\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\n\n\n\n\n\n\n
PDF Pages<\/th>\nPDF Title<\/th>\n<\/tr>\n
9<\/td>\nScope
Normative references <\/td>\n<\/tr>\n
10<\/td>\nTerms and definitions
Determination of nitrogen and oxygen
General
Combined determination of nitrogen and oxygen by an analyser
Principle <\/td>\n<\/tr>\n
11<\/td>\nReagents
Apparatus
Calibration
Procedure
General <\/td>\n<\/tr>\n
12<\/td>\nDetermination
Blank determinations
Calculation
Determination of nitrogen calculated as Si3N4
General <\/td>\n<\/tr>\n
13<\/td>\nAcid decomposition \u2014 Titration method
Principle
Reagents <\/td>\n<\/tr>\n
14<\/td>\nApparatus <\/td>\n<\/tr>\n
16<\/td>\nMass of test portion
Procedure <\/td>\n<\/tr>\n
17<\/td>\nMeasurement of recovery rate
Calculation
Acid decomposition \u2014 Photometry method
Principle <\/td>\n<\/tr>\n
18<\/td>\nReagents <\/td>\n<\/tr>\n
19<\/td>\nApparatus
Mass of test portion
Procedure <\/td>\n<\/tr>\n
20<\/td>\nBlank test
Plotting of calibration graph
Calculation
Inert-gas fusion \u2014 Thermal conductivity method
Principle
Reagents <\/td>\n<\/tr>\n
21<\/td>\nApparatus <\/td>\n<\/tr>\n
23<\/td>\nMass of test portion
Procedure <\/td>\n<\/tr>\n
24<\/td>\nBlank test
Calculation of calibration coefficient
Calculation <\/td>\n<\/tr>\n
25<\/td>\nDetermination of total nitrogen
Determination of total nitrogen by fusion decomposition
Determination of total nitrogen by Kjeldahl distillation
Determination of total nitrogen by microwave digestion
Determination of free Iron by Inductively Coupled Plasma Ato
General <\/td>\n<\/tr>\n
26<\/td>\nCopper sulfate method
Principle
Reagents
Apparatus <\/td>\n<\/tr>\n
27<\/td>\nInstrument conditions
Procedure
Calculation
Bromine\/methanol method
Principle <\/td>\n<\/tr>\n
28<\/td>\nReagents
Apparatus <\/td>\n<\/tr>\n
29<\/td>\nInstrument conditions
Procedure
Calculation <\/td>\n<\/tr>\n
30<\/td>\nDetermination of free aluminium and free magnesium
General
Acid decomposition \u2014 Inductively coupled plasma atomic emiss
Principle
Reagents <\/td>\n<\/tr>\n
31<\/td>\nApparatus
Mass of test portion
Procedure
Blank test
Plotting of calibration graph <\/td>\n<\/tr>\n
32<\/td>\nCalculation
Acid decomposition \u2014 Flame Atomic Absorption Spectrometry (F
Principle
Reagents
Apparatus
Procedure <\/td>\n<\/tr>\n
33<\/td>\nBlank test
Plotting of calibration graph
Calculation
Hydrogen generating method <\/td>\n<\/tr>\n
34<\/td>\nAnalysis of oxides
General
Wet methods
Flame atomic absorption and\/or inductively coupled plasma at
General
Sodium carbonate boric acid fusion method <\/td>\n<\/tr>\n
35<\/td>\nLithium metaborate fusion method
XRF fusion method after ignition of the sample
General
Loss on ignition <\/td>\n<\/tr>\n
36<\/td>\nFusion
Blanks and slope factors <\/td>\n<\/tr>\n
37<\/td>\nDetermination of silicon(IV) oxide, aluminium oxide, iron(II
General
Measurement of ratio on heat residue at 850\u00a0\u00b0C
Methods of determination of each component <\/td>\n<\/tr>\n
38<\/td>\nDetermination of oxide components
Calculation <\/td>\n<\/tr>\n
39<\/td>\nExpression of results
Test report <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":"

Chemical analysis of silicon-carbide-containing raw materials and refractory products – Determination of nitrogen, oxygen and metallic and oxidic constituents<\/b><\/p>\n\n\n\n\n
Published By<\/td>\nPublication Date<\/td>\nNumber of Pages<\/td>\n<\/tr>\n
BSI<\/b><\/a><\/td>\n2008<\/td>\n46<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":317724,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[2641],"product_tag":[],"class_list":{"0":"post-317717","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\/317717","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\/317724"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=317717"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=317717"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=317717"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}