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1、BRITISH STANDARD BS 6068-6.5: 1991 ISO 5667-5: 1991 Water quality Part 6: Sampling Section 6.5 Guidance on sampling of drinking water and water used for food and beverage processing Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 01:29:40 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6068-6.5
2、:1991 This British Standard, having been prepared under the direction of the Environment and Pollution Standards Policy Committee, was published under the authority of the Standards Board and comes into effect on 31 October 1991 BSI 03-1999 The following BSI references relate to the work on this sta
3、ndard: Committee reference EPC/44 Draft for comment 89/51651 DC ISBN 0 580 20058 2 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Environment and Pollution Standards Policy Committee (EPC/-) to Technical Committee EPC/44, upon which the
4、 following bodies were represented: Association of Consulting Scientists British Association for Chemical Specialities British Gas plc Chemical Industries Association Department of the Environment for Northern Ireland Department of the Environment (Water Directorate) Department of Trade and Industry
5、 (Laboratory of the Government Chemist) Electricity Supply Industry in England and Wales Industry Water Society Institute of Petroleum Institution of Gas Engineers Institution of Water and Environmental Management National Rivers Authority Royal Institute of Public Health and Hygiene Royal Society o
6、f Chemistry Scottish Association of Directors of Water and Sewerage Services Soap and Detergent Industry Association Water Companies Association Water Research Centre Water Services Association of England and Wales Amendments issued since publication Amd. No.DateComments Licensed Copy: sheffieldun s
7、heffieldun, na, Tue Dec 05 01:29:40 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6068-6.5:1991 BSI 03-1999i Contents Page Committees responsibleInside front cover National forewordii 1Scope1 2Normative references1 3Sampling equipment1 4Sampling procedure1 5Sampling technique4 6Safety precautions5 7
8、Volume of sample, handling of samples5 8Sample identification and records6 9Quality assurance of sampling and training of sampling personnel6 Annex A (normative) Report Sampling of drinking water and water used for food and beverage processing7 Annex B (informative) Bibliography8 Publication(s) refe
9、rred toInside back cover Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 01:29:40 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6068-6.5:1991 ii BSI 03-1999 National foreword This Section of BS 6068, which has been prepared under the direction of the Environment and Pollution Standards Policy
10、 Committee is identical with ISO 5667-5:1991 “Water quality Sampling Part 5: Guidance on sampling of drinking water and water used for food and beverage processing”. The international standard was prepared by subcommittee 6, Sampling, of Technical Committee 147, Water quality, of the International O
11、rganization for Standardization (ISO) with the active participation and approval of the UK. BS 6068 is being published in a series of Parts subdivided into Sections that will generally correspond to particular international standards. Sections are being, or will be, published in Parts 1 to 7, which
12、together with Part 0, are listed below. Part 0: Introduction; Part 1: Glossary; Part 2: Physical, chemical and biochemical methods; Part 3: Radiological methods; Part 4: Microbiological methods; Part 5: Biological methods; Part 6: Sampling; Part 7: Precision and accuracy. Cross-references Internatio
13、nal standardCorresponding British Standard ISO 2859-1:1989BS 6001 Sampling procedures for inspection by attributes Part 1:1991 Specification for sampling plans indexed by acceptable quality level (AQL) for lot-by-lot inspection (Identical) BS 6068 Water quality ISO 5667-1:1980Section 6.1:1981 Guidan
14、ce on the design of sampling programmes (Identical) ISO 5667-2:1991 aSection 6.2:1991 Guidance on sampling techniques (Identical) ISO 5667-3:1985Section 6.3:1986 Guidance on the preservation and handling of samples (Identical) ISO 8199:1988Section 4.2:1989 Guide to the enumeration of micro-organism
15、by culture (Identical) a In preparation Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 01:29:40 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6068-6.5:1991 BSI 03-1999iii This Section of BS 6068 is one of a group of standards dealing with the sampling of specific types of water. It should be
16、 read in conjunction particularly with BS 6068-6.1, BS 6068-6.2 and BS 6068-6.3 which deal respectively with the design of sampling programmes, sampling techniques and the preservation and handling of samples. The general terminology used is in accordance with that established by ISO/TC 147, Water q
17、uality, and more particularly, with the terminology on sampling given in BS 6068-1.2. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of it
18、self confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i to iv, pages 1 to 8, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be i
19、ndicated in the amendment table on the inside front cover. Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 01:29:40 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iv blank Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 01:29:40 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 5667-5:1991(E)
20、 BSI 03-19991 1 Scope This part of ISO 5667 establishes detailed principles to be applied to the design of sampling programmes, to sampling techniques and to the handling and preservation of samples of drinking water and water used for food and beverage processing (hereafter abbreviated for convenie
21、nce to drinking water). It includes the processing of water in a treatment plant (including the analysis of the raw water), the supervision of the treatment plant and the distribution system, and the search for defects in the system. This part of ISO 5667 does not include the sampling of sources suc
22、h as ground water, wells and natural and man-made lakes, the water from which may be used as raw water for a treatment plant. If it is necessary to take samples at these locations, for instance to find a source of contamination of the raw water, sample according to the relevant part of ISO 5667. Sam
23、pling is a vital pad of the monitoring programme for drinking water. It is important that the sampling purpose be defined as accurately as possible and that the measurements provide the required information in the most efficient and statistically representative manner. It is worthwhile expanding app
24、reciable time and effort on the planning and design of sampling programmes; careful planning will normally be well rewarded. Examples of sampling purposes are determination of the efficiency of the drinking water treatment plant or parts of it (oxidation, disinfection); quality monitoring of the wat
25、er leaving the treatment plant; quality monitoring of the water in the distribution system; search for the cause of pollution of the distribution system (customers complaints); Monitoring of the corrosive potential of drinking water in domestic plumbing; assessment of the effects of materials in con
26、tact with water on the water quality; monitoring of the influent water and the various processing stages in a food and beverage processing plant, including necessary treatment steps. 2 Normative references The following standards contain provisions which, through reference in this text, constitute p
27、rovisions of this part of ISO 5667. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this part of ISO 5667 are encouraged to investigate the possibility of applying the most recent editions of the standards indic
28、ated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO 2859-1:1989, Sampling procedures for inspection by attributes Part 1: Sampling plans indexed by acceptable quality level (AQL) for lot-by-lot inspection. ISO 5667-1:1980, Water quality Sampling Part
29、 1: Guidance on the design of sampling programmes. ISO 5667-21), Water quality Sampling Part 2: Guidance on sampling techniques. ISO 5667-3:1985, Water quality Sampling Part 3: Guidance on the preservation and handling of samples. ISO 8199:1988, Water quality General guide to the enumeration of micr
30、o-organisms by culture. 3 Sampling equipment Reference should be made to ISO 5667-2 for sampling equipment and requirements for materials in contact with the sample, and to ISO 5667-3 for cleaning of sample containers. 4 Sampling procedure 4.1 Sampling location Detailed guidance, including statistic
31、al consideration, is given in ISO 5667-1. The sampling location and local safety regulations (see clause 6) influence the method of sample collection. Before collection of the sample, it should be decided whether some of the analyses are to be performed on site. On-site analysis is recommended parti
32、cularly for such determinands as odour, taste, pH, chlorine, ozone, dissolved oxygen, acid (base) capacity, carbon dioxide, electrical conductivity, and for the assessment of the temperature of the water and the ambient air and the visual inspection of the sample. Cognizance should also be taken of
33、any national regulations requiring on-site analysis. 1) To be published. (Revision of ISO 5667-2:1982) Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 01:29:40 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 5667-5:1991(E) 2 BSI 03-1999 Before transporting the sample to the laboratory, the app
34、ropriate preservation technique has to be applied; reference should be made to the guidance given in ISO 5667-3 and the relevant analytical International Standards. 4.1.1 Service reservoir Samples should be collected from the inlet and outlet pipes, as close as possible to the service reservoir. Gen
35、erally, 2 min or 3 min of free flow should be allowed to flush out any stale water within the sampling line before taking a sample. If this is insufficient, calculate the volume of water that needs to be displaced from the pipe, estimate the flushing time required at an appropriate flushing rate, an
36、d then apply a flushing time of five times that value. Alternatively, when the reservoir is below ground, monitoring of the water temperature from the flushing may be useful in indicating when water from the reservoir is being withdrawn. Sometimes, for example when a reservoir has been out of servic
37、e or cleaned, or when there is no sampling valve on the outlet pipe, it may be necessary to take dip samples from service reservoirs, although this means of sampling should be avoided wherever possible. If it is essential to take dip samples, special care should be taken to ensure that the sampling
38、operation does not introduce debris into the water and that equipment is sterilized before sampling, to avoid contamination of the water in the reservoir. 4.1.2 Water treatment plant Samples should be collected from the inlet and outlet pipes as close as possible to the treatment plant. For monitori
39、ng of the different stages of water treatment, sampling should take place before and after the respective stage being monitored, for example sedimentation and filtration. If there is a disinfection and/or an oxidation plant, refer to 4.1.3. For monitoring of water treatment plants continuous time-pr
40、oportional sampling and continuous analysis (e.g. for pH value, turbidity, oxygen content) are often used. The sampling equipment should be used according to the manufacturers instructions; reference should also be made to ISO 5667-2 for further guidance. 4.1.3 Disinfection plant Samples from the in
41、fluent to the disinfection/oxidation plant should be collected as close as possible to the plant. Samples of the effluent should be collected after allowing for the appropriate contact period between water and disinfectant/oxidant. In some installations this contact period may depend upon utilizatio
42、n of part of the distribution systems (however, this is prohibited in some countries). In these situations samples taken to test the efficiency of the disinfection/oxidation stage should be taken at an appropriate point within the distribution system; alternatively, a sample line with an appropriate
43、 residence time may be used for sampling within the treatment plant, although this is not generally recommended. 4.1.4 Distribution system Samples should be collected at different locations in the distribution system and in particular from the ends of distribution systems, for example from predeterm
44、ined sampling taps or hydrants, which are located before any further treatment stages. Sampling from hydrants should be avoided wherever possible; if this is unavoidable special disinfection precautions are required, namely all surfaces of the hydrant that come into contact with the water should be
45、clean and free from debris, and disinfected by, for example, contact with a 5 % (m/m) to 10 % (m/m) available chlorine solution. The chlorine solution should be run to waste completely before sampling. The supply line to any sampling tap should be as short as possible. For microbiological purposes,
46、sampling taps should be sterilized by flame or alternative methods of equivalent efficacy, for example soaking in a chlorine solution (see previous paragraph), and should be maintained in good order. The water discharged by flushing should be able to run off freely. Samples should be taken in the tu
47、rbulent zone of a pipe if possible. A suitable sample location may be available in piping immediately downstream from a valve or fitting that is causing turbulent flow. The sampling line should not protrude inside the pipe wall. Water in a mains spur should not be considered as a representative samp
48、le (however, see the second last paragraph of this subclause). A need may arise to sample water where there is a very low flow. When taking the sample care should be taken that disturbance of sedimentary material does not occur. If this cannot be avoided, a sufficient volume of water should be flush
49、ed or a sufficient time allowed for a steady state to occur after the sampling valve has been opened or the flow disturbed. Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 01:29:40 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 5667-5:1991(E) BSI 03-19993 The sampling site should be investigated to find the correct sampling location for the chosen sampling purpose. For example, a hydrant may be more practical than a consumers tap when repeated sampling is required for monitoring of the dosing efficiency of, for e