Method for on-site rapid determination of heavy metal in river, lake and sea along with ship
A technology for rapid determination of heavy metals, applied in measuring devices, instruments, material analysis by electromagnetic means, etc., to achieve the effects of good accuracy, saving test time, and high sensitivity
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Embodiment 1
[0026] Example 1: On-site rapid determination of heavy metal lead and cadmium in simulated seawater
[0027] (1) The glassy carbon electrodes with a diameter of 3 mm are respectively made of Al with a particle size of 0.3 μm and 0.5 μm 2 O 3 Grind and polish to a smooth mirror surface, then ultrasonically clean with 0.5M sulfuric acid, absolute ethanol and ultrapure water for 5 minutes to remove impurities, blow dry with nitrogen or dry under infrared light for later use; choose Ag / AgCl as the reference electrode, platinum The wire is the counter electrode, placed in the electrode modifier solution containing 400mg / L bismuth ions, deposited at the potential of -0.9V for 600s, stirred by a magnetic stirrer, and coated with a uniform black bismuth film on the surface of the glassy carbon electrode. Obtain bismuth-coated film glassy carbon working electrode;
[0028](2) Measure 80 mL of 0.1M acetic acid-sodium acetate buffer (pH=4.5), add it to the test beaker, add a certain am...
Embodiment 2
[0032] Example 2: On-site rapid determination of heavy metals lead and cadmium in Nansha watershed
[0033] (1) The glassy carbon electrodes with a diameter of 3 mm were respectively used with Al particles with a particle size of 0.3 μm and 0.5 μm. 2 O 3 Polished to a smooth mirror surface, then ultrasonically cleaned with 0.5M sulfuric acid, anhydrous ethanol and ultrapure water for 5 minutes to remove impurities, dried with nitrogen or baked under infrared light for use; Ag / AgCl was used as the reference electrode, platinum The wire was used as the counter electrode, placed in an electrode modifier solution containing 800mg / L of antimony ions, deposited at -0.9V potential for 600s, stirred with a magnetic stirrer, and a black uniform antimony film was plated on the surface of the glassy carbon electrode. The antimony-coated glassy carbon working electrode is obtained;
[0034] (2) Measure 40 mL of 0.1M acetic acid-sodium acetate buffer (pH=4.5) and 40 mL of water samples f...
Embodiment 3
[0038] Example 3: On-site rapid determination of heavy metals lead and cadmium in the offshore waters of Nansha
[0039] (1) The glassy carbon electrodes with a diameter of 3 mm were respectively used with Al particles with a particle size of 0.3 μm and 0.5 μm. 2 O 3 Polished to a smooth mirror surface, then ultrasonically cleaned with 0.5M sulfuric acid, anhydrous ethanol and ultrapure water for 5 minutes to remove impurities, dried with nitrogen or baked under infrared light for use; Ag / AgCl was used as the reference electrode, platinum The wire is the counter electrode, placed in the tin ion electrode modifier solution containing 600mg / L, deposited at -0.9V potential for 600s, stirred with a magnetic stirrer, and a black uniform tin film was plated on the surface of the glassy carbon electrode. A tin-coated glassy carbon working electrode is obtained;
[0040] (2) Measure 40 mL of 0.1M acetic acid-sodium acetate buffer (pH=4.5) and 40 mL (volume ratio 1:1) of water sample...
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