This standard specifies the technical performance requirements and test methods for on-line automatic analyzer of Chemical Oxygen Demand (COOCr) in surface water and sewage discharged by enterprises and institutions.
This standard is applicable to the production, application selection and performance inspection of on-line automatic analyzer (hereinafter referred to as automatic analyzer) of CODCr in surface water and sewage.
2 Normative references
The following normative document contains provisions which, through reference in this text, constitute provisions of this standard. For undated references, the latest edition of the normative document referred to applies.
GB/T 11914 Water quality - Determination of the chemical oxygen demand - Dichromate method
GB/T 13306 Plates
GB 9969.1 General principles for preparation of instructions for use of industrial products
3 Terms and definitions
3.1
specimen
surface water such as rivers and lakes and sewage discharged by enterprises and institutions that are led into automatic analyzers
3.2
correction fluid
the test solution prepared in order to obtain the same indicator value as CODCr concentration of the sample, which is classified into several categories, including zero correction fluid and range correction fluid
3.3
zero drift
the change in the indicated value of the automatic analyzer within a certain period of time when the zero correction fluid specified in this standard is used for continuous testing of specimen
3.4
range drift
the change in the indicated value of the instrument within a certain period of time relative to the measuring range of the automatic analyzer when the range correction fluid specified in this standard is used for continuous testing of specimen
