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Analysis of Food for Contamination

At present, clean food products have been interested because they impact to health human directly. Arsenic has been tested in a variety of contaminated food products. To accurately test foods, the EDX provides a solution for testing if a food product contains as low as  0.5 ppm (and below) of Arsenic. Using a number of x-ray beam filters, the EDX 7000/8000 is able to increase the signal to noise ratio of the As signal.

Application Data

The following four (4) figures show various spectrums of Arsenic in differing concentrations. In addition the benefit of using a primary beam filter is shown in Figure 4. Notice how the spectrum is greatly enhanced through the use of a Ni beam filter.

Figure 1. 0.39% Arsenic in Oolong Tea.

Figure2. 0.35% Arsenic in Orange Juice

 

Figure 3. 0.39% of Arsenic in Curry

Figure 4. 10 ppm As, viewed with and without a Ni filter. Notice the Signal to Noise Enhancement.

Result Summary

Quantitative Accuracy:

Samples were made with 0.39% As. Semi-quantitative results, without the use of standards showed the following results.

Element

Oolong Tea

Juice

Curry

As

H2O

   0.39%
  99.61%

   0.35%
  99.65%

   0.33%
  99.67%

Minimum Detection Limits:

The minimum detection limit of Arsenic with and without filters is shown in Table 1.

Measurement Times

With Ni Filter

Without Filter

40 Seconds

0.9 ppm

2.0 ppm

100 Seconds

0.6 ppm

1.3 ppm

1000 Seconds

0.19 ppm

0.4 ppm


Measuring Conditions :

Instrument      : EDX-700

X-ray Tube     : Rh

Filter               : Ni or Without

Atmosphere    : Air

Power: 50 kV at 15 mA

Dead Time 25%

Measurement Diameter 10 mm Measurement Time 40 Seconds

Others

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