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Rapid quantitation heavy metals in food -HS XRF with Fast FP

2020-02-12 16:13:08   

• Application Overview 

      The contents of lead, cadmium, mercury, arsenic and chromium in food affect human health. Every country and region has strict restrictions on their contents. Normally the measure methods for  heavy metals in the food have AA、ICP-MS and so on. These methods, for example ICP-MS, are complex, time-consuming and high-cost, which cannot meet the demands for the rapid detection of the heavy metals in the food.
 

     The high sensitivity XRF heavy metal analyzer of the PHECDA series adopts the monochromatic focusing excitation technology, which greatly reduces the background interference of the scattered rays generated by the X-ray tube, improves the intensity of the elements' fluorescence rays, and reduces the limit of detection of the heavy metals in the food matrix to 0.06mg/kg level, so as to meet the requirements of the supreme limit value detection of the heavy metals in the food.

     The Fast FP method interprets the physics theory of the various effects including the X-ray generation, excitation of the sample elements fluorescence, and the various effects detected by the detector into the mathematical models. Through large amount calculation and calibration using a few standard samples, the quantitative analysis of the sample elements can be completed. Fast FP method calculates the background difference caused by the difference of the sample matrix, so expand the testing range of food.

     The combination of a high-sensitivity XRF heavy metal analyzer and Fast FP fills in the blank of the current fast detection methods of the heavy metal for the aquatics, meat, vegetables, and fruits, improves detection efficiency, and escorts the food safety.

• Detection the food types

      Beans, grain, fish and sea food, vegetables, fruits, meat, food products, etc.

• Application areas

      Market supervision, Customs supervision, Public food security, Food distribution, etc.

• LOD
                                                               Table 1  LOD ( PHECDA-PRO ) of the heavy metal elements in food matrix

the metal elements	Pb	Cd	Hg	As	Cr	Ni	Sn	Tl
LOD①	0.06	0.04	0.1	0.05	0.2	0.1	0.1	0.07

Note①：300 seconds/element

• Repeatability
                                                               Table 2  Repeatability of the heavy metal elements in food matrix

Times	As	Pb	Cd
1	0.45	0.26	0.25
2	0.45	0.21	0.23
3	0.48	0.21	0.3
4	0.42	0.27	0.28
5	0.48	0.22	0.31
6	0.47	0.18	0.32
7	0.44	0.24	0.25
8	0.45	0.19	0.31
9	0.42	0.26	0.28
10	0.42	0.2	0.28
11	0.44	0.23	0.23
Average	0.447	0.224	0.276
Standard Value	0.498	0.220	0.261
Recovery rate	90%	102%	106%
RSD（%）	5.0	13.4	11.7

 

• Accuracy
                                                     Table 3  Accuracy of chromium, arsenic, lead and cadmium of the standard samples

Elements	GBW10020 Certified±U        Found     (mg/kg)         (mg/kg)	GBW10047 Certified±U        Found     (mg/kg)         (mg/kg)	GBW10048 Certified±U        Found     (mg/kg)         (mg/kg)	GBW10049 Certified±U        Found     (mg/kg)         (mg/kg)	GBW10051 Certified±U        Found     (mg/kg)         (mg/kg)
Cr	1.25±0.11        1.290	0.59±0.11         0.497	1.35±0.22       1.323	2.6±0.4            2.610	0.23±0.06        0.223
As	1.1±0.2          1.250	1.1±0.02           0.100	0.39±0.08       0.387	0.53±0.11          0.473	1.4±0.3          1.370
Pb	9.7±0.9         10.400	0.47±0.07          0.450	2.7±0.7        2.566	1.34±0.16          1.480	0.12±0.03        0.113
Cd	0.17±0.02        0.140	0.034±0.004       0.020	0.092±0.006    0.093	0.019±0.02         0.021	1±0.07          1.010

Note：The experiment was completed by the China Academy of Metrology  



Note：The experiment was completed by the Shanghai Customs Animal-Plant -Food Inspection and Quarantine Center

        The consistency verification experiments with the test data of ICP-MS, the correlation coefficients of cadmium and arsenic are above 0.95, and PHECDA with Fast FP is in good agreement with the standard methods of the laboratory.

• Sample treatment

        Ancoren provides pretreatment equipments and standard operating procedures for the various food

• The rapid detection solution of Food heavy metals: HS XRF with Fast FP 

1)     The high-sensitivity X-ray fluorescence spectrometry（HS XRF^®）
        The monochromatic wavelength excitation XRF with double curved crystal as the core technology. It can greatly reduce the background of the scattered rays, improve the signal-to-noise ratio of the element fluorescence. The detection limit of lead, cadmium and arsenic in the food is reduced to 0.06mg/kg; 

2)     Advanced fast fundamental parameters method（Fast FP^®）
        The Fast FP can automatically perform baseline deduction and match the background of different food substrates, and simultaneously identify and calculate the various interference spectra. The deviations generated by the calculation can be corrected by several standard samples to obtain accurate quantitative values of the elements;

3)     High accuracy detection
        The application can get consistent analysis results with the laboratory standard methods. It has extremely low false positive rate and false negative rate;

4)    Mobile portability
       PHECDA-PRO weighs 8.5kg, has excellent mobile portability, strong environmental adaptability, and can work normally within -10 ℃ ~ 40 ℃;

5)     Rapid detection
        The pretreatment of the food samples is fast and simple, and the detection speed of the instrument is within 10 minutes, which meets the needs of the rapid and high-throughput analysis.

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