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Real-time monitoring solutions for heavy metal emissions in air and water

2022-06-25 17:39:28   

Application Overview

   "GB 31574-2015 Emission Standards for Pollutants in the Recycled Copper", Aluminium, Lead and Zinc Industries stipulates emission limits for water and air pollutants in the production process of recycled non-ferrous metal industrial enterprises, where the key monitoring items are the emission of heavy metal pollutants, involving a number of heavy metals such as copper, zinc, lead, arsenic, nickel, cadmium, chromium, antimony and mercury, etc. The determination methods include atomic absorption spectrophotometry (AA), spectrophotometric These analytical methods require complex processing of samples, such as digestion, which is time-consuming and labour-intensive, with high instrument investment costs and low sample throughput, putting pressure on enterprises and analytical workers.

   "HJ 829-2017 Ambient Air Determination of Inorganic Elements in Particulate Matter Energy Dispersive X-ray Fluorescence Spectrometry (ED XRF) "specifies a method for the ED XRF determination of a number of inorganic elements such as arsenic, lead, tin, antimony, cadmium and chromium in atmospheric pollutants. The single wavelength excitation energy dispersive X-ray fluorescence spectrometry with rapid basic parameter method allows for the rapid and accurate determination of heavy metals in air filtration membranes without the need to purchase expensive standards, without sample pre-treatment and with simple operation.

    Ancoren patented technology (ZL2018 1 0412342.2) water quality heavy metal enrichment diaphragm (HMET) in combination with HS XRF^® can analyse heavy metals such as copper, zinc, lead, arsenic, nickel, cadmium, chromium, antimony and mercury in water pollutants in one go, with detection limits much lower than the discharge limit requirements, fast analysis speed and high testing accuracy.

  The monochromatic excitation energy dispersive X-ray fluorescence spectrometer and the fast fundamental parameter method provide a complete solution for heavy metal detection of pollutant emissions in recycled non-ferrous metal enterprises, with low investment and detection costs, high sample throughput and detection accuracy, to ensure real-time monitoring of environmental emission standards for enterprises.

Method principle
(1)Hardware core technology
Monochromatic excitation

 The fully focused hyperbolic bent crystal (HF DCC) diffracts and focuses the characteristic rays of the target in the X-ray tube emission spectrum to a single point of the sample, significantly reducing the interference of the continuous scattered ray background in the X-ray tube emission spectrum to the elemental spectrum of the sample and improving the signal-to-noise ratio for elemental detection, and the monochromatic excitation focused excitation energy dispersive X-ray fluorescence spectrometer has the ability to detect trace elements.





(2)Software core technology
Fast fundamental parameter method（Fast FP2.0®）

The fundamental parameter method is a cutting-edge technology for quantitative XRF analysis, which establishes a library of fundamental parameters and advanced mathematical models for the clear phenomena of X-ray fluorescence physics, and directly obtains the content of each element in the sample after extensive calculations, solving the complexity and uncertainty of quantitative analysis due to XRF matrix effects, inter-element absorption enhancement effects, spectral overlap interference and various detector effects, and realising the lack of standard The quantitative analysis of the elements in the sample is achieved in the absence of a standard sample.


(3)Water Heavy Metal Enrichment Membrane Technology (HMET)









    A certain volume of water quality sample (usually set at 20ml) is passed through the enrichment membrane, metal ions will be enriched to the membrane, the concentration ratio reaches 100 times, the enriched membrane sample is further analysed by HS XRF to obtain the value of each heavy metal content, the combination of HMET and HSXRF technology, the water quality heavy metal detection limit is reduced to 1~2ug/L, to meet the surface waterIIIThe combination of HMET and HSXRF technology enables the detection limit of heavy metals to be reduced to 1~2ug/L, meeting the requirements of the permissible limits for surface water.

Performance parameters

GB 31574-2015 Comparison of emission limits and methodological detection limits  for heavy metals for water pollutants

Unit: mg/L

Heavy Metals Project	Total Copper	Total zinc	Total lead	Total arsenic	Total Nickel	Total cadmium	Total Chromium	Total antimony	Total mercury
Limit values	0.2	1	0.2	0.1	0.1	0.01	0.5	0.3	0.01
Method detection limit	0.003	0.005	0.003	0.003	0.005	0.002	0.005	0.005	0.002

GB 31574-2015 Comparison table of emission limits and method detection limits  for air pollutants

Heavy Metals Project	Arsenic	Lead	Tin	Antimony	Cadmium	Chromium
Limit value (mg/m³)	0.4	2/1	1	1	0.05	1
Method detection limit (ug/cm²)	0.003	0.003	0.005	0.005	0.002	0.003

Note: The conversion relationship between standard limits and method detection limits is based on the volume of air sample sampled and the area of the diaphragm.

Repeatability
(1) Water quality: heavy metal ion content 0.005mg/L water sample, 7 consecutive analyses, RSD <10%
(2) Air filter membrane: 0.1ug/cm² of heavy metals and their oxides, 7 consecutive analyses, RSD <10%

Accuracy
(1)Water quality: heavy metal content 0.01mg/L, analytical error <±10%
(2)Air filter membrane: heavy metal content 1.0ug/cm², analytical error <±10%

Features and advantages
  High precision

Single-wavelength focused excitation technology applied to XRF, significantly reducing the detection limit of elements and improving the analytical accuracy to meet the needs of trace or trace element analysis.


  High speed
Simple sample handling, with individual sample determination times of less than 10 minutes.

   Easy to operate

Basic parametric method and built-in standard curves to perform analysis without the need for specialist personnel.

  Conformity to standards

HJ 829-2017 Ambient air Determination of inorganic elements in particulate matter Energy dispersive X-ray fluorescence spectrometry.

  Low investment

Real-time monitoring of discharged water and air for heavy metal contaminants in a single instrument, with no reagents or gases required for the testing process.

Configuration options

Serial number	Item	Model	Unit	Number
1	Single wavelength excitation energy dispersive X-ray fluorescence spectrometer	PHECDA-ECO (portable) or PHECDA-HE (desktop)	Terrace	1
2	Water quality heavy metal enrichment devices	Water-prep	Terrace	1
3	Rapid Basic Parameter Method Software System	Fast FP	set	1
4	Heavy metal enrichment diaphragm for water (HMET)	HMET-A,HMET-C	individual	200
5	Sample cups		individual	200
6	Sample film		Box	1
7	Water quality standards (QC) samples		set	2
8	Air filter membrane standard (QC) samples		individual	1
9	Installation kit, instructions		set	1

Original statement:
This article is the original work of ancoren company except for the quotation. If it is forwarded and quoted, the source must be indicated, otherwise it may involve infringement. For more detailed technical information, please consult the staff of Ancoren.

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