Experimental equipment and consumables
One set of ammonia nitrogen-Nash method reagent consumables, some distilled water, one 100-1000μL pipette, one 1-5ml pipette (other standard measuring tools can also be used), several matching pipette heads, one test tube rack, Several empty digestion colorimetric tubes (Φ16mm, 10ml)
Reagent preparation
Ammonia Nitrogen Reagent 1: Liquid reagent in drop bottle, use directly.
Ammonia Nitrogen Reagent 2: drop bottled liquid reagent, use directly.
Detection method:
(To estimate the ammonia nitrogen value of the water sample, follow the steps below for detection. If the sample to be tested has high chroma and large interference, it may be necessary to refer to HJ535-2009 for sampling after distillation)
Wear protective equipment as required during operation, and avoid contact with skin and clothing.
Don’t throw away the discarded reagents and the residual liquid after detection. They should be disposed of properly and safely.
If the indicated value of the instrument is not within the range of the test range, it cannot be regarded as the final test result. If you have any questions, please consult the after-sales service.
① When the estimated ammonia nitrogen value is 0-5mg/L:
A. Turn on the Detector to warm up
B. Take several empty digestion colorimetric tubes in the test tube rack
C. Blank sample: add 5ml of distilled water to the empty tube
D. Sample to be tested: Add 5ml of water sample to be tested into the empty tube (if there are many insoluble substances in the water sample to be tested, please filter and take a sample)
L. Add 3 drops of ammonia nitrogen reagent 1 to the blank sample tube and the sample tube to be tested, tighten the cap of the tube, and shake it upside down
M. Add 3 drops of ammonia nitrogen reagent 2 into the blank sample tube and the sample tube to be tested, tighten the cap of the tube, shake it upside down
E. Stand still for 10 minutes
F. Select the ammonia nitrogen-Nash (0-5mg/L) detection item on the Detector, according to the operation prompts, first do blank calibration, and then measure the sample to be tested (before testing, please ensure that there is no insoluble matter in the blank sample tube and the sample tube to be tested , the outer wall is clean and free from scratches)
G. Data direct reading and printing
② When the estimated ammonia nitrogen value is 5-50mg/L:
1. Turn on the Detector to warm up
2. Take several empty digestion colorimetric tubes in the test tube rack
3. Blank sample: add 5ml distilled water to the empty tube
4. Sample to be tested: Dilute the water sample to be tested 10 times, and add 5ml of the diluted sample to the empty tube (if the water sample to be tested has a lot of insoluble matter, please filter it and take a sample)
5. Add 3 drops of ammonia nitrogen reagent 1 to the blank sample tube and the sample tube to be tested, tighten the cap of the tube, and shake it upside down
6. Add 3 drops of ammonia nitrogen reagent II to the blank sample tube and the sample tube to be tested, tighten the cap of the tube, and shake it upside down
7. Stand still for 10 minutes
8. Select the ammonia nitrogen-Nash (5-50mg/L) detection item on the Detector, and perform blank calibration first according to the operation prompts, and then measure the sample to be tested (before testing, please ensure that there is no insoluble matter in the blank sample tube and the sample tube to be tested , the outer wall is clean and free from scratches)
9. Data direct reading and printing (the indicated value of the instrument is the final concentration of the water sample)
③ When the estimated ammonia nitrogen value of the water sample is greater than 50mg/L:
It is necessary to dilute the ammonia nitrogen value of the water sample to 0-5mg/L, and carry out the test according to the test method ①. The concentration of the water sample = the indicated value of the instrument × the dilution factor.
