Device and method for monitoring nitrogen nutrient salts in environmental water by atomic fluorescence method
An atomic fluorescence and environmental monitoring technology, applied in the field of atomic fluorescence analysis, can solve the problem of unsatisfactory detection limit, and achieve the effect of expanding the range of detectable elements
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Embodiment 1
[0043] A method for monitoring nitrogen nutrients in environmental water by atomic fluorescence method, comprising the steps of:
[0044] Step 1, when measuring nitrite:
[0045] The three-way valve 3 is switched to the B valve position to ensure that the carrier gas does not flow through the reaction cell, and 3mL of nitrite solution (GBW(E)080223) and 0.8mL KI+H 3 PO 4 Solution (the concentration of KI is 0.1M, H 3 PO 4 The concentration is 10M, and the two are in the ratio KI:H 3 PO 4 = 1:3 mixing), mixed in the four-way mixer 2 through the AFS flow injection system 1, heated and stirred at 80°C and 1200rpm, reacted for 60s, and generated NO gas; then, the three-way valve 3 was switched to the A valve position, the 300mL / min argon gas introduced from the carrier gas cylinder 4 through the A valve position of the three-way valve 3 loads the generated NO vapor into the gas-liquid separator 11 and the calcium chloride drying tube to fully complete the gas-liquid separatio...
Embodiment 2
[0052] Use the NO steam generation-atomic fluorescence photometer device of the present invention to measure nitrite, nitrate and ammonium salts in tap water, a method for monitoring nitrogen nutrients in environmental water by atomic fluorescence is the same as in Example 1, the difference is that the determination When the nitrate content is low, it needs to be acidified to pH<2 with concentrated sulfuric acid.
[0053]In this embodiment, the fluorescent signal obtained is converted into concentration according to the standard curve regression equation, and the values of nitrite, nitrate and ammonium salt in tap water are respectively 0mg / L, 1.82±0.10mg / L and 0.35±0.02mg / L, the spiked recoveries were 98.3%, 102.9% and 102.7% when the tap water samples were spiked with 0.5mg / L, 5mg / L and 0.5mg / L respectively.
Embodiment 3
[0055] Use NO vapor generation-atomic fluorescence photometer device of the present invention to measure nitrite, nitrate and ammonium salt in lake water, a kind of method of atomic fluorescence method monitoring nitrogen nutrient salt in environmental water is the same as embodiment 1, and difference is that the determination Before sampling the lake water, filter it with a 0.22 μm filter membrane. When measuring the nitrate content, use concentrated sulfuric acid to acidify it to pH<2.
[0056] In this embodiment, the fluorescent signal obtained is converted into concentration according to the standard curve regression equation, and the values of nitrite, nitrate and ammonium salt in the lake water are respectively 0.05±0.01mg / L, 3.48±0.22mg / L and 0.11 ±0.02mg / L, the recoveries were 98.4%, 97.6% and 97.6% when adding the standard at 0.5mg / L, 1mg / L and 10mg / L respectively.
[0057] The invention can detect trace nitrogen nutrient salts in environmental water samples, and th...
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