Ultra-limit control method for high-concentration sample electric heating evaporation sample introduction and device using method
A technology of electrothermal evaporation and over-limit control, which is applied in the preparation of test samples, etc., can solve the problems of high analysis results, time-consuming and labor-intensive, and low analysis results, and achieve the effects of simple steps, simple operation and simple structure.
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Embodiment 1
[0029] The atomic fluorescence spectrometer determines that the element is cadmium (Cd), and the sample is a Cd standard aqueous solution with a concentration of 100 μg / kg. The low-condition process of heating and evaporating cadmium is carried out according to the conditions listed in Table 1. In order to determine the part of the Cd standard aqueous solution after the low-condition process The percentage of the evaporated Cd to the total Cd, within the range not exceeding the measuring range, each injection is evaporated once through a low-condition process and all the remaining Cd is evaporated. The specific injection conditions, evaporation conditions and the obtained results are shown in Table 2 .
[0030] As shown in Table 2: the partially evaporated Cd after the low-condition process accounts for 1-2.5% of the total Cd, so the peak area of the partially evaporated analyte is calculated by (40~100) to obtain the estimated peak value of the total analyte The peak area, ...
Embodiment 2
[0041] The element determined by atomic fluorescence spectrometer is cadmium (Cd), the sample is GSS-2 soil standard material (the reference value of Cd content is 71±14μg / kg), and the low-condition process of heating and evaporating cadmium is carried out according to the conditions listed in Table 4. After the low-condition process, the percentage of Cd partially evaporated from the GSS-2 soil standard substance to the total Cd, within the range not exceeding the range, each injection is evaporated once in the low-condition state and all the remaining Cd is evaporated, The specific injection conditions, evaporation conditions and the obtained results are shown in Table 5.
[0042] As shown in Table 5, the partially evaporated Cd after the low-condition process accounts for 1-2% of the Cd, so the peak area of the partially evaporated analyte x (50~100) is obtained to obtain the estimated peak of the total analyte The area, which is close to the actual peak area value of the...
Embodiment 3
[0052] The element measured by atomic fluorescence spectrometer is mercury (Hg), and the sample is GBW10010 rice standard substance (the reference value of Hg content is 5.3±0.5μg / kg). The percentage of Hg partially evaporated from the GBW10010 rice standard material to the total Hg after low conditions. Within the range not exceeding the measurement range, each sample is evaporated once through the process of low conditions and all the remaining Hg is evaporated. The specific injection conditions , evaporation conditions and the obtained results are shown in Table 8,
[0053] As shown in Table 8, the partially evaporated Hg after the low-condition process accounts for 1-2% of the Hg, so the peak area of the partially evaporated analyte x (50~100) is used to obtain the estimated peak of the total analyte The area, which is close to the actual peak area value of the total analyte, is used to calculate the peak height to determine whether the peak height exceeds the range. Ac...
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