Standard No.:	GB/T 19421-2008
English Name:	Test methods of crystalline layered sodium disilicate
Chinese Name:	层状结晶二硅酸钠试验方法
Chinese Classification:	G72    Basic standards and general methods for surface active agent
Professional Classification:	GB    National Standard
ICS Classification:	71.100.40 71.100.40    Surface active agents 71.100.40
Source Content Issued by:	AQSIQ; SAC
Issued on:	2008-05-28
Implemented on:	2008-12-1
Status:	superseded
Superseded by:	GB/T 19421.1-2003 Test methods of crystalline layered sodium disilicate―Qualitative analysis of delta-crystalline layered sodium disilicate―Method of X-ray diffractometer GB/T 19421-2026 Test methods of crystalline layered sodium disilicate
Superseded on:	2026-11-1
Abolished on:	2026-11-01
Superseding:	GB/T 19421.2-2003 Test methods of crystalline layered sodium disilicate―Measurement of whiteness GB/T 19421.1-2003 Test methods of crystalline layered sodium disilicate―Qualitative analysis of delta-crystalline layered sodium disilicate―Method of X-ray diffractometer GB/T 19421.11-2003 Test methods of crystalline layered sodium disilicate--Atomic absorption spectrophotometric methods for determination of calcium oxide content GB/T 19421.12-2003 Test methods of crystalline layered sodium disilicate--Atomic absorption spectrophotometric methods for determination of magnesium oxide content GB/T 19421.10-2003 Test methods of crystalline layered sodium disilicate--Potassium fluosilicate volumetric methods for determination of silica dioxide content GB/T 19421.8-2003 Test methods of crystalline layered sodium disilicate--Phenanthroline photometric methods for determination of iron oxide content GB/T 19421.9-2003 Test methods of crystalline layered sodium disilicate--Potassium fluosilicate volumetric methods for determination of sodium oxide content GB/T 19421.6-2003 Test methods of crystalline layered sodium disilicate-Gravimetric methods for determination of the loss on ignition GB/T 19421.7-2003 Test methods of crystalline layered sodium disilicate-Gravimetric methods for determination of hygroscopic moisture GB/T 19421.5-2003 Test methods of crystalline layered sodium disilicate--EDTA volumetric methods for determination of magnesium exchange capacity content GB/T 19421.4-2003 Test methods of crystalline layered sodium disilicate--EDTA volumetric methods for determination of calciumion exchange capacity GB/T 19421.3-2003 Test methods of crystalline layered sodium disilicate--Method for determination of pH
Target Language:	English
File Format:	PDF
Word Count:	10500 words
Translation Price(USD):	315.0
Delivery:	via email in 1~5 business day

本标准是对ＧＢ／Ｔ１９４２１．１～１９４２１．１２—２００３的整合修订。本标准规定了洗涤剂助剂层状结晶二硅酸钠的δ相X射线衍射仪法定性分析及其白度、pH值、钙交换能力、镁交换能力、灼烧失量、湿存水量、三氧化二铁、氧化钠、二氧化硅、氧化钙、氧化镁等指标的测试方法。本标准适用于洗涤剂用层状结晶二硅酸钠产品的指标测定，同时也适用于洗涤剂用其他类型硅酸盐产品的部分指标测定。本标准与ＧＢ／Ｔ１９４２１．１～１９４２１．１２—２００３《层状结晶二硅酸钠试验方法》相比，主要变化如下：
———将原测定方法标准整合后作为本标准的第４章～第１５章；
———删除“层状结晶二硅酸钠白度”术语；
———增加“δ相Ｘ 射线衍射仪法”、“钙交换能力”、“镁交换能力”、“灼烧失量”、“湿存水量”等五项
术语；
———更正了原标准中一些编辑性错误。