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Identification of Iodine and Bromine of soil

2020-02-17 20:18:15   

• Application overview

       At present, there are few detection methods for bromine and iodine in soil or rock. The mainly analysis methods include the ion chromatography, electrochemical methods and other methods. There are problems such as the poor repeatability of the analysis results, complex sample processing, and single type of the analysis elements. Meanwhile, the analysis using traditional XRF of the bromine and iodine in the soil also has problems such as insufficient detection limits, interferences between the background and matrix and so on. There are few related literatures and reports about the detection of the bromine and iodine.

       The high sensitivity XRF for the heavy metals makes use of the monochromatic focused excitation to greatly reduce the background interference of the scattered rays caused by the emission spectrum of the X-ray tube. So it improves the elemental signal-to-noise ratio, and reduces the detection limit of the bromine and iodine in soil or rocks to “ppm” level, so as to meet the requirements of quantitative analysis. The Fast FP method transforms 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 a large number of calculations and calibration with a few standard samples, the quantitative analysis of the elements can be completed.

       Ancoren has developed a complete application program: a combination of the high-sensitivity XRF and Fast FP method for the quantitative analysis of the bromine and iodine in soil or rocks. It has the characteristics of the simple sample processing, quantitative detection, and fast analysis speed.


• Performance data

1）LOD
Table 1: Limit of detection of the bromine and iodine in the soil

Element	I	Br
LOD (mg/kg)	0.3	0.5

2）Accuracy
Table 2: Accuracy concentration of the iodine in the standard samples

Sample ID	Standard value(I)	Analysis value (I)	Relative deviation
GSD16	0.27±0.08	0.29	6.70%
GBW07409	0.44	0.36	-19.20%
GSS30	0.87±0.05	1.14	30.70%
GSS14	0.9±0.2	0.83	-8.10%
GSS16	1.3±0.1	1.3	0.00%
GSS3	1.3±0.2	1.71	31.20%
GSS12	1.4±0.2	1.62	16.10%
GSS18	1.4±0.2	1.72	23.00%
GSS20	1.4±0.4	1.79	27.7%
GSS2	1.8±0.2	1.25	-30.50%
GSS1	1.8±0.3	1.41	-21.50%

 
Table 3: Accuracy concentration of the bromine in the standard samples

Sample ID	Standard value(Br)	Analysis value (Br)	Relative deviation
GSD15	0.8±0.2	0.65	-18.80%
GSS17	0.8±0.2	0.71	-11.30%
GSS30	1.43	1.36	-4.90%
GSS14	1.7±0.3	1.4	-17.60%
GSS12	2.1±0.3	2.47	17.60%
GSS16	2.6±0.3	3.1	19.20%
GSS1	2.9±0.6	2.4	-17.20%
GSS2	4.5±0.7	4.3	-4.40%
GSS18	7.2±1.0	6.9	-4.20%

3）Repeatability
Table 4: Repeatability of the bromine and iodine in the standard samples

Sample ID	Br	I
GSS14-1	1.46	0.93
GSS14-2	1.57	0.63
GSS14-3	1.53	0.86
GSS14-4	2.01	0.71
GSS14-5	1.72	0.83
GSS14-6	1.67	0.76
GSS14-7	1.32	1.03
RSD	13.6%	16.5%

• Advantages

1）Synchronous analysis
The application can synchronously analyze the concentration of the bromine and iodine in soil or rocks;

2）Wide adaptability
The Fast FP method accurately calculates and subtracts the matrix differences due to the difference of the soil or rock types, and accurately analyzes the concentration of the elements to be measured;

3）Accuracy
The Fast FP method can eliminate the matrix difference and spectrum interferences, and calibrate calculation errors through a few standard samples to improve quantitative accuracy;

4）Simple sample processing
The simple pretreatment methods for the soil or rock samples are provided;

5）On-site analysis
The portable PHECDA-ECO is light for the weight and easy to carry, which can be used for on-site testing;

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