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HJ 609-2011: The Technical Requirement for water Quality Automatic On-line Monitor of Chromium(VI)
HJ 609-2011
HJ
NATIONAL ENVIRONMENTAL PROTECTION STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
The technical requirement for water quality
automatic on-line monitor of chromium (VI)
ISSUED ON. FEBRUARY 11, 2011
IMPLEMENTED ON. JUNE 01, 2011
Issued by. Ministry of Environmental Protection
Announcement
2011 No.12
Ministry of Environmental Protection
of the People’s Republic of China
To implement “Environmental Protection Law of the People’s Republic of China”,
protect environment, guarantee human health, normalize environmental monitoring
work, now the “The technical requirement for water quality automatic on-line monitor
of chromium (VI)” is approved as national environmental protection standard, and
hereby it is issued.
The standard name and number are as follows.
The technical requirement for water quality automatic on-line monitor of chromium (VI)
(HJ 609-2011)
This Standard will be implemented from June 1, 2001, published by China
Environmental Science Press; the content of the standard can be checked on the
website of Ministry of Environmental Protection (bz.mep.gov.cn).
The notice is hereby given.
February 11, 2011
Table of Contents
Announcement ... 2 
Foreword ... 4 
1 Scope ... 5 
2 Normative references ... 5 
3 Terms and definitions ... 5 
4 Method principle and measuring range ... 6 
5 Performance index and test method ... 7 
6 Technical requirements ... 10 
7 Operating instructions ... 12 
Foreword
To implement “Environmental Protection Law of the People’s Republic of China” and
“Water Pollution Prevention Law of the People’s Republic of China”, normalize the
technical performance for water quality automatic on-line monitor of chromium (VI),
improve the ability of water environment monitoring, this Standard is formulated.
This Standard specifies the performance, test method and technical requirement for
water quality automatic on-line monitor of chromium (VI).
This Standard was first-time released.
This Standard was organized and formulated by Ministry of Environmental Protection -
Department of Science, Technology and Standard.
Drafting organizations of this Standard. China Leather and Footwear Industry
Research Institute, Beijing Technology and Business University, Universtar Science
and Technology (Shenzhen) Co., Ltd., Hangzhou Focused Photonics Environmental
Science and Technology Co., Ltd., Hunan Lihe Science and Technology Development
Co., Ltd., Yiwen Environmental Science Technology Co., Ltd., and American Hach
Company.
This Standard was approved by Ministry of Environmental Protection on February 11,
2011.
This Standard shall be implemented on June 1, 2011.
This Standard shall be interpreted by Ministry of Environmental Protection.
The technical requirement for water quality
automatic on-line monitor of chromium (VI)
1 Scope
This Standard specifies the performance, test method and technical requirement for
water quality automatic on-line monitor of chromium (VI).
This Standard applies to the production, application selection, and performance test of
automatic on-line monitor of chromium compound ion (VI) in surface water, sanitary
sewage and industrial waste water.
2 Normative references
The following documents or provisions are essential to the application of this document.
For the undated documents, the effective versions are applicable to this document.
GB 7467 Water quality - Determination of chromium (VI) - Diphenylcarbazide
spectrophotometric method
GB/T 13306 Plates
HJ 168 Environmental monitoring - Technical guideline on drawing and revising
analytical method standards
HJ/T 212 Standard for data communication of pollution emission auto monitoring
system
HJ 477 The technical requirement for data acquisition and transmission
equipment of pollution emission auto monitoring system
3 Terms and definitions
The following terms and definitions are applicable to this Standard.
3.1
Zero drift
It refers to, adopting the zero calibration solution specified in this Standard as the
sample to test continuously, in a certain period of time, the percentage OF changes of
indicated value of water quality automatic on-line monitor of chromium (VI) RELATIVE
to the measuring range.
3.2
Measuring range drift
It refers to, adopting the measuring-range calibration solution specified in this
Standard as the sample to test continuously, in a certain period of time, the
percentage OF changes of indicated value of water quality automatic on-line monitor
of chromium (VI) RELATIVE to the measuring range.
3.3
Mean time between failures
It refers to the ratio OF the total running time (hour) of water quality automatic on-line
monitor of chromium (VI) during the period of test TO the failure frequency (times),
expressed by “MTBF”, the unit is h/time.
4 Method principle and measuring range
4.1 Method principle
Water quality automatic on-line monitor of chromium (VI) can adopt
spectrophotometric method or other analytical method.
In which, the principle of spectrophotometric method. in the acid solution, chromium
compound ion (VI) and diphenylcarbazide (DPC) react and generate the purple
compound; determine the spectrophotometer at 540mm wavelength. Above steps are
automatically controlled and completed by the on-line monitor, from water-sample
importing to concentration calculation, so as to realize the automation of chromium (VI)
monitoring.
4.2 Structure of water quality automatic on-line monitor of chromium (VI)
Sampling/metering unit. includes sample, reagent importing part, and sample and
reagent metering part.
Analytical unit. has the function of changing the measured value into electric signal
output; through controlling the unit, complete the automatically on-line analysis of
samples. At the same time, it shall also include the function aimed at zero and
measuring-range calibration.
Controlling unit. includes system controlling hardware and software, with the functions
such as data collecting, processing, display storage and data output.
4.3 Measuring range
displaying part shall be uniform and clear; there shall be no vignette, black spots,
rainbow, bubble and flicker etc. It can use the displaying tips to do the comprehensive
program operation; the character, symbol and mark of description function are neat.
6.1.3 There shall be no cracks, deformation, muddiness and glitch etc.; the surface
coating shall be uniform, without corrosion, rust, detachment and abrasion. Product
assembly shall be firm; and the components shall not be loose. The control of button,
switch and lock etc. shall be flexible and reliable.
6.2 Performance requirements
6.2.1 Sampling/metering unit
6.2.1.1 It shall be made of anti-corrosive material so that the determination result will
not be impacted because of the corrosion of reagents or actual waste water.
6.2.1.2 The measuring parts shall guarantee the accuracy of reagents and actual
waste water sampling; the operating instructions shall clarify the maximum particle
size of suspension that can go through the instrument internal pipeline.
6.2.1.3 It shall have internal pipeline self-cleaning function which can prevent from
cross contamination between different samples.
6.2.2 Analytical unit
6.2.2.1 It shall be made of anti-corrosive material of which the structure shall be easy
to be cleaned.
6.2.2.2 The output signal of determination value shall be stable. Within the