標準編號:	GB/T 5750.7-2023
中文名稱:	生活飲用水標準檢驗方法 第7部分：有機物綜合指標
英文名稱:	Standard examination methods for drinking water—Part 7: Aggregate organic indices
中標分類:	C51    環境衛生
行業分類:	GB    國家標準
ICS分類:	13.060 13.060     13.060
發布機構:	國家市場監督管理總局 國家標準化管理委員會
發布日期:	2023-03-17
實施日期:	2023-10-1
標準狀態:	valid
替代舊標準:	GB/T 5750.7-2006 生活飲用水標準檢驗方法 有機物綜合指標
翻譯語言:	英文
文件格式:	PDF
中文字符數:	27000 字
翻譯價格(元):	1890.0
交付時間:	付款后 1~5 個工作日

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《標準化工作導則第1部分標準化文件的結構和起草規則》的規定起草 本文件是GB/T 5750《生活飲用水標準檢驗方法》的第7部分。GB/T 5750已經發布了以下部分: 第1部分:總則; 第2部分:水樣的采集與保存: 第3部分:水質分析質量控制; 第4部分:感官性狀和物理指標 第5部分:無機非金屬指標; 第6部分:金屬和類金屬指標; 第7部分:有機物綜合指標; 第8部分:有機物指標 第9部分:農藥指標; 第10部分:消毒副產物指標 第11部分:消毒劑指標; 第12部分:微生物指標: 第13部分:放射性指標。 本文件代替GB/T 5750.7-2006《生活飲用水標準檢驗方法有機物綜合指標》與GB/T 5750.7-2006相比，除結構調整和編輯性改動外,主要技術變化如下: a增加了“術語和定義”(見第3章) b)增加了3個檢驗方法(見4.3,4.7.2): c)將指標“耗氧量”更改為“高錳酸鹽指數(以O計)”(見第4章2006年版的第1章)請注意本文件的某些內容可能涉及專利。本文的發布機構不承擔識別專利的責任本文件由中華人民共和國國家衛生健康委員會提出并歸口。 引言 GB/T 5750《生活飲用水標準檢驗方法》作為生活飲用水檢驗技術的推薦性國家標準與GB 5749《生活飲用水衛生標準》配套,是GB 5749的重要技術支撐,為貫徹實施GB 5749,開展生活飲用水衛生安全性評價提供檢驗方法。 GB/T 5750由13個部分構成。 第1部分:總則。目的在于提供水質檢驗的基本原則和要求。 第2部分:水樣的采集與保存。目的在于提供水樣采集、保存、管理、運輸和采樣質量控制的基本原則、措施和要求。 第3部分:水質分析質量控制。目的在于提供水質檢驗檢測實驗室質量控制要求與方法 第4部分:感官性狀和物理指標。目的在于提供感官性狀和物理指標的相應檢驗方法 第5部分:無機非金屬指標。目的在于提供無機非金屬指標的相應檢驗方法 第6部分:金屬和類金屬指標。目的在于提供金屬和類金屬指標的相應檢驗方法 第7部分:有機物綜合指標。目的在于提供有機物綜合指標的相應檢驗方法 第8部分:有機物指標。目的在于提供有機物指標的相應檢驗方法。 第9部分:農藥指標。目的在于提供農藥指標的相應檢驗方法。 第10部分:消毒副產物指標。目的在于提供消毒副產物指標的相應檢驗方法 第11部分:消毒劑指標。目的在于提供消毒劑指標的相應檢驗方法 第12部分:微生物指標。目的在于提供微生物指標的相應檢驗方法 第13部分:放射性指標。目的在于提供放射性指標的相應檢驗方法 1范圍 本文件描述了生活飲用水中高錳酸鹽指數(以0計)石油、總有機碳的測定方法和水源水中高酸鹽指數(以O計)生化需氧量(BOD)石油、總有機碳的測定方法。 本文件適用于生活飲用水和(或)水源水中有機物綜合指標的測定 2規范性引用文件 下列文件中的內容通過文中的規范性引用而構成本文件必不可少的條款。其中，注日期的引用文件,僅該日期對應的版本適用于本文件;不注日期的引用文件,其最新版本(包括所有的修改單)適用于本文件。 GB/T 5750.1生活飲用水標準檢驗方法第1部分:總則 GB/T 5750.3生活飲用水標準檢驗方法第3部分:水質分析質量控制 GB/T 5750.4-2023生活飲用水標準檢驗方法第4部分:感官性狀和物理指標 GB/T 6682分析實驗室用水規格和試驗方法 3術語和定義 GB/T 5750.1、GB/T 5750.3界定的術語和定義適用于本文件 4高酸鹽指數(以0,計) 4.1酸性高錳酸鉀滴定法 4.1.1最低檢測質量濃度 4.2堿性高錳酸鉀滴定法 4.2.1最低檢測質量濃度 本方法適用于氯化物質量濃度高于300mg/L(以CI計)的生活飲用水及其水源水中高酸鹽指數(以0計)的測定。本方法的最低檢測質量濃度(取100ml水樣時)為0.05mg/L(以0計)最高可測定高錳酸鹽指數(以O計)質量濃度為50mg/L。 4.2.2原理 高錳酸鉀在堿性溶液中將還原性物質氧化，酸化后過量高酸鉀用草酸鈉溶液滴定 4.2.3試劑 4.2.3.1氫氧化鈉溶液(500g/L):稱取50g氧化(NaH),溶于純水中,稀釋至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條件下，微生物分解水中有機物的生物化學過程所需溶解氧的量取原水或經過稀釋的水樣,使其中含足夠的溶解氧,將該樣品同時分為兩份，一份測定當日溶解氧的質量濃度,另一份放入20C培養箱內培養5d后再測其溶解氧的質量濃度，兩者之差即為五日生化需氧量(BOD,)。 5.1.2試劑 5,1.2.1氯化鈣溶液(27.5g/L)稱取27.5g無水氯化(CaCl)溶于純水中,稀釋至1000mL 5.1.2.2氯化鐵溶液(0.25g/L):稱取0.25g六水合氯化鐵(FeCl·6HO)溶于純水中,稀釋至1000mI 6石油 6.1稱量法 6.1.1原理 水樣經石油醚萃取后,蒸發去除石油醚,稱量,計算水中石油的含量。用本方法測定的結果是水中可被石油醚萃取物質的總量。 6.1.2試劑 6.1.2.1硫酸(p2=1.84g/mL)。 6.1.2.2石油醚(沸程30“C~60C):經70C水浴重蒸留 6.2紫外分光光度法 6.2.1最低檢測質量濃度 本方法最低檢測質量為5g,若取1000mL水樣測定，則最低檢測質量濃度為0.005g/L。 6.2.2原理 石油組成中所含的具有共驅體系的物質在紫外區有特征吸收。具苯環的芳烴化合物主要吸收波長位于250nm~260nm;具共雙鍵的化合物主要吸收波長位于215nm~230nm;一般原油的兩個吸收峰位于225nm和256nm;其他油品如燃料油潤滑油的吸收峰與原油相近，部分油品僅一個吸收峰。經精煉的一些油品如汽油則無吸收。因此在測量中應注意選擇合適的標準，原油和重質油可選256nm;輕質油可選225nm,有條件時可從污染的水體中取或從污染源中取得測定的標準物。 6.2.3試劑 6.2.3.1無水硫酸鈉:經400C干1h,冷卻后儲存于密塞的試劑瓶中 7總有機碳 7.1直接測定法 7.1.1最低檢測質量濃度 本方法最低檢測質量濃度為0.5mg/L。 7.1.2原理 向水樣中加人適當的氧化劑,或紫外催化(TiO)等方法,使水中有機碳轉為二氧化碳(CO)。無機碳經酸化和吹脫被除去,或單獨測定。生成的CO可直接測定，或還原為CH，后再測定。CO的測定方法包括:非色散紅外光譜法、滴定法(最好在非水溶液中)熱導池檢測器(TCD)電導滴定法、電量滴定法、CO敏感電極法和把CO還原為CH后焰離子化檢測器(FID)。 7.2膜電導率測定法 7.2.1最低檢測質量濃度 本方法最低檢測質量濃度為0.20mg/L。 7.2.2原理 向水樣中加人適當的氧化劑，或使用紫外催化等方法,使水中有機碳轉化為CO2。無機碳經酸化和脫氣被除去,或單獨測定。生成的CO使用選擇性薄膜電導檢測技術進行測定。