标准编号:	GB/T 5750.7-2023
中文名称:	生活饮用水标准检验方法 第7部分：有机物综合指标
英文名称:	Standard examination methods for drinking water—Part 7: Aggregate organic indices
中标分类:	C51    环境卫生
行业分类:	GB    国家标准
ICS分类:	13.060 13.060     13.060
发布机构:	国家市场监督管理总局 国家标准化管理委员会
发布日期:	2023-03-17
实施日期:	2023-10-1
标准状态:	valid
替代旧标准:	GB/T 5750.7-2006 生活饮用水标准检验方法 有机物综合指标
翻译语言:	英文
文件格式:	PDF
中文字符数:	27000 字
翻译价格(元):	1890.0
交付时间:	付款后 1~5 个工作日

Foreword This document is drafted in accordance with the provisions of GB/T 1.12020 "Standardization Work Guidelines Part 1 Structure and Drafting Rules for Standardization Documents This document is part 7 of GB/T 5750 "Standard Test Methods for Drinking Water". GB/T 5750 has published the following parts. Part 1: General Provisions. Part 2: The collection and preservation of water samples. Part 3: Quality control of water quality analysis. Part 4: Sensory properties and physical indicators Part 5: Inorganic non-metallic indicators. Part 6: Metal and metal-like indicators. Part 7: Organic composite indicators. Part 8: Organic indicators Part 9: Pesticide indicators. Part 10: Disinfection by-product indicators Part 11: Disinfectant indicators. Part 12: Microbial indicators. Part 13:Radioactive indicators. This document replaces GB/T 5750.7-2006 "Standard Test Methods for Drinking Water Organic Matter Comprehensive Index" compared with GB/T 5750.7-2006, in addition to structural adjustments and editorial changes, the main technical changes are as follows. a) increased the "terms and definitions" (see Chapter 3) b) The addition of three test methods (see 4.3, 4.7.2). c) Changed the indicator "oxygen consumption" to "permanganate index (in O)" (see chapter 4, chapter 1 of the 2006 edition) Please note that some of the contents of this document may be patent related. The publisher of this document does not assume responsibility for identifying patents. This document is proposed by and attributed to the National Health Care Commission of the People's Republic of China. Introduction GB/T 5750 "Standard Test Methods for Drinking Water" as the recommended national standard for drinking water testing technology and GB 5749 "Drinking Water Sanitation Standards" supporting the important technical support of GB 5749, for the implementation of GB 5749, to carry out health and safety assessment of drinking water to provide test methods. GB/T 5750 consists of 13 parts. Part 1: General Provisions. The purpose is to provide the basic principles and requirements of water quality testing. Part 2: the collection and preservation of water samples. The purpose is to provide water samples collected, preservation, management, transport and sampling quality control of the basic principles, measures and requirements. Part 3: quality control of water quality analysis. The purpose is to provide water quality inspection and testing laboratory quality control requirements and methods Part 4: Sensory traits and physical indicators. The purpose is to provide sensory traits and physical indicators of the corresponding test methods Part 5: inorganic non-metallic indicators. The purpose is to provide inorganic non-metallic indicators of the corresponding test methods Part 6: Metals and metal-like indicators. The purpose is to provide metal and metal-like indicators of the corresponding test methods Part 7: Organic composite indicators. The purpose is to provide a comprehensive index of organic substances corresponding test methods Part 8: organic indicators. The purpose is to provide the corresponding test methods for organic indicators. Part 9: Pesticide indicators. The purpose is to provide the corresponding test methods for pesticide indicators. Part 10: Disinfection by-products indicators. The purpose is to provide the corresponding test methods for disinfection by-product indicators Part 11: Disinfectant indicators. The purpose is to provide the corresponding test methods for disinfectant indicators Part 12: Microbiological indicators. The purpose is to provide the corresponding test methods for microbial indicators Part 13: radioactive indicators. The purpose is to provide the corresponding test methods for radioactive indicators 1 Scope This document describes the determination of permanganate index (in 0) oil, total organic carbon in drinking water and water source water permanganate index (in O) biochemical oxygen demand (BOD) oil, total organic carbon determination method. This document applies to the determination of the comprehensive index of organic matter in drinking water and (or) water source water 2 Normative reference documents The following documents constitute the essential provisions of this document through the normative references in the text. Among them, note the date of the reference document, only the date of the corresponding version applies to this document; do not note the date of the reference document, its latest version (including all the revision of the list) applies to this document. GB/T 5750.1 Standard test methods for drinking water Part 1: General Provisions GB/T 5750.3 Standard test methods for drinking water Part 3: Quality control of water quality analysis GB/T 5750.4-2023 Standard test methods for drinking water Part 4: sensory properties and physical indicators GB/T 6682 Analytical laboratory water specifications and test methods 3 Terms and definitions GB/T 5750.1, GB/T 5750.3 defined terms and definitions apply to this document 4 Permanganate index (in 0,count) 4.1 Acidic potassium permanganate titration method 4.1.1 Minimum detection mass concentration 4.2 Alkaline potassium permanganate titration method 4.2.1 Minimum detectable mass concentration This method applies to the determination of chloride mass concentration higher than 300mg/L (in CI) of drinking water and its source water permanganate index (in 0). The minimum detection quality concentration of this method (when taking 100ml of water samples) is 0.05mg/L (in terms of 0), the maximum determination of permanganate index (in terms of O) quality concentration of 50mg/L. 4.2.2 Principle Potassium permanganate oxidizes reducing substances in alkaline solution, and after acidification, excess potassium permanganate is titrated with sodium oxalate solution 4.2.3 Reagents 4.2.3.1 Sodium hydroxide solution (500g/L): weigh 50g of oxidation (NaH), dissolve in pure water and dilute to 100mL. 5 Biochemical oxygen demand (BOD) 5.1 Volumetric method 5.1.1 Principle Biochemical oxygen demand is the amount of dissolved oxygen required for the biochemical process of microbial decomposition of organic matter in water under aerobic conditions, take the raw water or diluted water samples, so that it contains sufficient dissolved oxygen, the sample will be divided into two parts at the same time, one to determine the mass concentration of dissolved oxygen on the day, and the other into the 20C incubator for 5d and then measured the mass concentration of dissolved oxygen, the difference between the two is the five-day biochemical oxygen demand ( BOD,). 5.1.2 Reagents 5.1.2.1 Calcium chloride solution (27.5g/L) Weigh 27.5g of anhydrous chloride (CaCl) dissolved in pure water and dilute to 1000mL. 5.1.2.2 Ferric chloride solution (0.25g/L): weigh 0.25g of ferric chloride hexahydrate (FeCl-6HO) dissolved in pure water, dilute to 1000mI 6 Petroleum 6.1 Weighing method 6.1.1 Principle After extraction of water samples by petroleum ether, evaporation to remove petroleum ether, weighing, and calculate the content of petroleum in water. The results measured by this method is the total amount of substances extractable by petroleum ether in water. 6.1.2 Reagents 6.1.2.1 sulfuric acid (p2 = 1.84g/mL). 6.1.2.2 Petroleum ether (boiling range 30 "C ~ 60C): by 70C water bath re-evaporation to stay 6.2 UV spectrophotometric method 6.2.1 Minimum detectable mass concentration The minimum detection mass of this method is 5g, if 1000mL of water samples are taken for determination, the minimum detection mass concentration is 0.005g/L. 6.2.2 Principle The substances contained in the petroleum composition with co-driven system have characteristic absorption in the UV region. Aromatic compounds with benzene rings mainly absorb at 250nm~260nm; compounds with co-double bonds mainly absorb at 215nm~230nm; crude oil in general has two absorption peaks at 225nm and 256nm; other oils such as fuel oil lubricants have absorption peaks similar to crude oil, and some oils have only one absorption peak. Some oils such as gasoline are not absorbed after refining. Therefore, in the measurement should pay attention to the selection of suitable standards, crude oil and heavy oil optional 256nm; light oil optional 225nm, when available, can be taken from the polluted water or from the source of pollution to obtain the determination of the standard. 6.2.3 Reagents 6.2.3.1 anhydrous sodium sulfate: dry at 400C for 1h, cool and store in a tightly closed reagent bottle 7 Total organic carbon 7.1 Direct determination method 7.1.1 Minimum detection mass concentration The minimum detectable mass concentration of this method is 0.5mg/L. 7.1.2 Principle To the water sample with the appropriate oxidant, or ultraviolet catalysis (TiO) and other methods, so that the water organic carbon to carbon dioxide (CO). Inorganic carbon is removed by acidification and purging, or measured separately. The generated CO can be directly measured, or reduced to CH, and then measured.CO determination methods include: non-dispersive infrared spectroscopy, titration (preferably in non-aqueous solutions) thermal conductivity cell detector (TCD) conductivity titration, power titration, CO-sensitive electrode method and the reduction of CO to CH after the flame ionization detector (FID). 7.2 Membrane conductivity determination method 7.2.1 Minimum detection mass concentration The minimum detection mass concentration of this method is 0.20mg/L. 7.2.2 Principle The organic carbon in water is converted to CO2 by adding appropriate oxidant to the water sample or using UV catalysis, etc. The inorganic carbon is removed by acidification and degassing, or measured separately. The generated CO is measured using a selective thin film conductivity detection technique.

Foreword Introduction 1 Scope 2 Normative reference documents 3 Terms and definitions 4 Permanganate index (in 0,count) 5 Biochemical oxygen demand (BOD) 6 Petroleum 7 Total organic carbon

前言 本文件按照GB/T 1.12020《标准化工作导则第1部分标准化文件的结构和起草规则》的规定起草 本文件是GB/T 5750《生活饮用水标准检验方法》的第7部分。GB/T 5750已经发布了以下部分: 第1部分:总则; 第2部分:水样的采集与保存: 第3部分:水质分析质量控制; 第4部分:感官性状和物理指标 第5部分:无机非金属指标; 第6部分:金属和类金属指标; 第7部分:有机物综合指标; 第8部分:有机物指标 第9部分:农药指标; 第10部分:消毒副产物指标 第11部分:消毒剂指标; 第12部分:微生物指标: 第13部分:放射性指标。 本文件代替GB/T 5750.7-2006《生活饮用水标准检验方法有机物综合指标》与GB/T 5750.7-2006相比，除结构调整和编辑性改动外,主要技术变化如下: a增加了“术语和定义”(见第3章) b)增加了3个检验方法(见4.3,4.7.2): c)将指标“耗氧量”更改为“高锰酸盐指数(以O计)”(见第4章2006年版的第1章)请注意本文件的某些内容可能涉及专利。本文的发布机构不承担识别专利的责任本文件由中华人民共和国国家卫生健康委员会提出并归口。 引言 GB/T 5750《生活饮用水标准检验方法》作为生活饮用水检验技术的推荐性国家标准与GB 5749《生活饮用水卫生标准》配套,是GB 5749的重要技术支撑,为贯彻实施GB 5749,开展生活饮用水卫生安全性评价提供检验方法。 GB/T 5750由13个部分构成。 第1部分:总则。目的在于提供水质检验的基本原则和要求。 第2部分:水样的采集与保存。目的在于提供水样采集、保存、管理、运输和采样质量控制的基本原则、措施和要求。 第3部分:水质分析质量控制。目的在于提供水质检验检测实验室质量控制要求与方法 第4部分:感官性状和物理指标。目的在于提供感官性状和物理指标的相应检验方法 第5部分:无机非金属指标。目的在于提供无机非金属指标的相应检验方法 第6部分:金属和类金属指标。目的在于提供金属和类金属指标的相应检验方法 第7部分:有机物综合指标。目的在于提供有机物综合指标的相应检验方法 第8部分:有机物指标。目的在于提供有机物指标的相应检验方法。 第9部分:农药指标。目的在于提供农药指标的相应检验方法。 第10部分:消毒副产物指标。目的在于提供消毒副产物指标的相应检验方法 第11部分:消毒剂指标。目的在于提供消毒剂指标的相应检验方法 第12部分:微生物指标。目的在于提供微生物指标的相应检验方法 第13部分:放射性指标。目的在于提供放射性指标的相应检验方法 1范围 本文件描述了生活饮用水中高锰酸盐指数(以0计)石油、总有机碳的测定方法和水源水中高酸盐指数(以O计)生化需氧量(BOD)石油、总有机碳的测定方法。 本文件适用于生活饮用水和(或)水源水中有机物综合指标的测定 2规范性引用文件 下列文件中的内容通过文中的规范性引用而构成本文件必不可少的条款。其中，注日期的引用文件,仅该日期对应的版本适用于本文件;不注日期的引用文件,其最新版本(包括所有的修改单)适用于本文件。 GB/T 5750.1生活饮用水标准检验方法第1部分:总则 GB/T 5750.3生活饮用水标准检验方法第3部分:水质分析质量控制 GB/T 5750.4-2023生活饮用水标准检验方法第4部分:感官性状和物理指标 GB/T 6682分析实验室用水规格和试验方法 3术语和定义 GB/T 5750.1、GB/T 5750.3界定的术语和定义适用于本文件 4高酸盐指数(以0,计) 4.1酸性高锰酸钾滴定法 4.1.1最低检测质量浓度 4.2碱性高锰酸钾滴定法 4.2.1最低检测质量浓度 本方法适用于氯化物质量浓度高于300mg/L(以CI计)的生活饮用水及其水源水中高酸盐指数(以0计)的测定。本方法的最低检测质量浓度(取100ml水样时)为0.05mg/L(以0计)最高可测定高锰酸盐指数(以O计)质量浓度为50mg/L。 4.2.2原理 高锰酸钾在碱性溶液中将还原性物质氧化，酸化后过量高酸钾用草酸钠溶液滴定 4.2.3试剂 4.2.3.1氢氧化钠溶液(500g/L):称取50g氧化(NaH),溶于纯水中,稀释至100mL。 5生化需氧量(BOD) 5.1容量法 5.1.1原理 生化需氧量是指在有氧条件下，微生物分解水中有机物的生物化学过程所需溶解氧的量取原水或经过稀释的水样,使其中含足够的溶解氧,将该样品同时分为两份，一份测定当日溶解氧的质量浓度,另一份放入20C培养箱内培养5d后再测其溶解氧的质量浓度，两者之差即为五日生化需氧量(BOD,)。 5.1.2试剂 5,1.2.1氯化钙溶液(27.5g/L)称取27.5g无水氯化(CaCl)溶于纯水中,稀释至1000mL 5.1.2.2氯化铁溶液(0.25g/L):称取0.25g六水合氯化铁(FeCl·6HO)溶于纯水中,稀释至1000mI 6石油 6.1称量法 6.1.1原理 水样经石油醚萃取后,蒸发去除石油醚,称量,计算水中石油的含量。用本方法测定的结果是水中可被石油醚萃取物质的总量。 6.1.2试剂 6.1.2.1硫酸(p2=1.84g/mL)。 6.1.2.2石油醚(沸程30“C~60C):经70C水浴重蒸留 6.2紫外分光光度法 6.2.1最低检测质量浓度 本方法最低检测质量为5g,若取1000mL水样测定，则最低检测质量浓度为0.005g/L。 6.2.2原理 石油组成中所含的具有共驱体系的物质在紫外区有特征吸收。具苯环的芳烃化合物主要吸收波长位于250nm~260nm;具共双键的化合物主要吸收波长位于215nm~230nm;一般原油的两个吸收峰位于225nm和256nm;其他油品如燃料油润滑油的吸收峰与原油相近，部分油品仅一个吸收峰。经精炼的一些油品如汽油则无吸收。因此在测量中应注意选择合适的标准，原油和重质油可选256nm;轻质油可选225nm,有条件时可从污染的水体中取或从污染源中取得测定的标准物。 6.2.3试剂 6.2.3.1无水硫酸钠:经400C干1h,冷却后储存于密塞的试剂瓶中 7总有机碳 7.1直接测定法 7.1.1最低检测质量浓度 本方法最低检测质量浓度为0.5mg/L。 7.1.2原理 向水样中加人适当的氧化剂,或紫外催化(TiO)等方法,使水中有机碳转为二氧化碳(CO)。无机碳经酸化和吹脱被除去,或单独测定。生成的CO可直接测定，或还原为CH，后再测定。CO的测定方法包括:非色散红外光谱法、滴定法(最好在非水溶液中)热导池检测器(TCD)电导滴定法、电量滴定法、CO敏感电极法和把CO还原为CH后焰离子化检测器(FID)。 7.2膜电导率测定法 7.2.1最低检测质量浓度 本方法最低检测质量浓度为0.20mg/L。 7.2.2原理 向水样中加人适当的氧化剂，或使用紫外催化等方法,使水中有机碳转化为CO2。无机碳经酸化和脱气被除去,或单独测定。生成的CO使用选择性薄膜电导检测技术进行测定。