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Emergency monitoring of Heavy Metals in Environmental water quality

2022-06-21 15:19:19   

Overview


 

 Water is the source of life, and the safety of water quality is related to the life and health of the earth's organisms. Under natural conditions, rainwater is naturally filtered and precipitated to form surface water and groundwater, which constitute the water source for all life. However, with the development of industry, various human factors such as mine scouring, industrial and mining wastewater, domestic sewage, etc. have made the heavy metal content in the water rise sharply, and the water quality has deteriorated. Especially for the rapid spread of water flow in sudden pollution incidents, it is very easy to cause serious social harm.
    Due to the disadvantages of large instrument volume, tedious operation, and long detection cycle, the analysis of the laboratory method is hardly used for fast monitoring of the heavy metals on the spot. Therefore, the rapid detection of heavy metals in water has an urgent need, especially the on-site rapid detection of heavy metals in water has important significance and practical value.
   At present, a fast and accurate analysis of heavy metals in water based on the portable high-sensitivity XRF combined with the technology of Heavy Metal Enrichment Tablet (HMET®) has been proposed by Beijing Ancoren  Technology Co.,LTD, which has the advantages of portability, simple sample processing, fast analysis speed, ultra-low detection limit, and high precision, and provides a reliable solution for the detection of heavy metals in various water.

Technology Principle

    Based on the standard: GB 3838-2002 Environmental Quality Standard for Surface Water, Class II water limit value requirements.
①Using the enrichment device to automatically enrich the heavy metals in the water, the elements to be measured will be enriched on the HMET water diaphragm；
②The enriched HMET film was detected using a portable high-sensitivity X-ray fluorescence spectrometer to obtain the type and content of heavy metals to be measured, which can be detected to the milligram per liter (ppb) level.

 Application Areas
Including and not limited to surface water, domestic drinking water, treated sewage, wastewater, etc.


Comparison with other fast inspection technologies

HMET tablet coupled with HS XRF	Anodic Stripping Voltammetry	Heavy metal rapid identification kit
No reagents to be added	The working electrode of the corresponding metal is required	Need to add color developer
Elemental detection limits up to ppb level	Part of the element detection limit can reach ppb level	High detection limit,more than 1mg/L
Simultaneous determination of multiple metal ions	Measurement of one ion type in a single pass	Specific ion type
Enrichment device can be automatically enriched, easy to operate	Complicated operation	Complicated operation
Determination of a wide range of metal ions	Measurement of conventional metal ions only	Measurement of conventional metal ions only

Application characteristics
  Rapidity

Quantitative analysis of heavy metals in water from sample processing to detection can be completed in 10 minutes.


  No need to add various regulators, internal standard agents or various other reaction reagents, etc.
Only 20mL of water samples need to be collected on site, no need to add acid or alkaline solution or various chemical reagents, etc.


  High accuracy

PHECDA-PRO weighs 9.7 kg, which has excellent portability, and it can work within -10 ℃ ~ 40 ℃ ,which shows the strong environmental adaptability.


  Ultra-low Method Detection Limit

The Single-wavelength excited XRF with hyperbolic curved crystal as its core, significantly reduces the background of scattered rays and improves the signal-to-noise ratio, and further enhances the capabilities for heavy-metal detection by using of the technology of HMET, The Method Detection Limits of As, Pb and Cd in water reach 1 ~ 3ug/L.


  Wide adaptability

Heavy metal detection can be applied to a variety of water quality such as surface water, groundwater, corporate sewage, drinking water, etc.


  High accuracy

Consistency analysis with the laboratory standard methods can be obtained.


Application Performance
(1)Limits of Detection
 
    Table 1  Table of detection limits of heavy metals tested by High-sensitivity X-ray fluorescence combined with HMET
                                                                                                                                                                                unit: mg/L

Elements	Cu	Zn	Se	As	Hg	Cd	Cr6+	Pb	Tl
Limit value requirements	1.0	1.0	0.01	0.05	0.00005	0.005	0.05	0.01	0.0001
Method Detection Limit	0.005	0.005	0.003	0.003	0.002	0.002	0.005	0.003	0.002

(2)Spectrums

Fig 2 .Comparison of spectrums before and after enrichment of 10ppb standard aqueous solution

It is obvious from the above spectra that the characteristic X-ray fluorescence peaks of each element after enrichment are more obvious and meet the requirements of quantitative analysis.

(3) Linearity

                      Fig. 3. Linearity of the Calibration Curve for Water Quality Heavy Metals  

(4) Repeatability
                     Table 2   Repeatability of tests on 10ppb Standard Aqueous Solution

Times	Cr6+	As	Hg	Mn	Pb	Tl	Cd
1	10.19	11.75	9.63	9.40	9.78	8.70	9.58
2	10.45	8.58	8.56	11.78	11.39	9.55	8.95
3	11.02	8.79	9.31	9.43	9.33	11.43	10.53
4	9.37	10.91	8.04	10.21	10.22	11.33	11.28
5	8.22	10.41	11.24	8.94	8.91	9.03	9.43
6	9.60	8.66	11.45	9.69	10.31	8.68	9.82
7	11.80	9.78	10.59	9.16	8.29	12.09	12.04
Avg	10.09	9.84	9.83	9.80	9.75	10.12	10.23
RSD	12%	13%	13%	10%	10%	14%	11%

 Program Showcase




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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