What is the reaction of nitrogen plus nitrates?
Under normal circumstances, there would be no direct reaction between nitrogen and nitrates. Nitrate can be reduced to nitrates under oxygen and acidic conditions. Under water conditions, it can be oxided to nitrate-nitrogen or reduced to nitrogen. In special cases such as electrocatalyze, nitrogen can be oxided to nitrates. For example, using a Perovskite-type catalyst as an electrocatalyst to convert nitrogen into nitrates. However, there was no information on the reaction between nitrogen and nitrates. Read more exciting novels for free
Absorbency of blank value of nitrogen and nitrogen
In the detection of nitrogen and nitrogen, the blank light absorption referred to the light absorption obtained by measuring the light source, the cuvette, and other optical systems without any sample. The blank absorption range of nitrogen nitrogen was a key factor in the process of nitrogen nitrogen detection. It played an important role in ensuring the accuracy and reliability of the test results. The reagent blank for the determination of nitrogen and nitrogen shall have an absorption value of not more than 0.030 (10mm cuvette), and the test water blank shall have an absorption value of not more than 0.030 to meet the requirements of determining the absence of nitrogen and nitrogen. "Little Fox Fairy" is equally exciting. Everyone is welcome to click and read it!
Nessler's reagent standard curve for determining nitrogen nitrogen
The following is the content related to the standard curve of Nessler's reagent for determining nitrogen and nitrogen: 1. ** Steps of Drawing the Calibrating Curv ** - Add 0.00, 0.50, 1.00, 2.00, 4.00, 6.00, 8.00, and 10.00ml of the standard working solution of nitrogen into eight 50ml color comparison tubes, respectively. The corresponding contents of the standard working solution of nitrogen and nitrogen are 0.0, 5.0, 10.0, 20.0, 40.0, 60.0, 80.0, and 100.0 ug, respectively. Add water to the marking line. - Add 1.0ml of the solution of potassium-Na tartrate and shake it well. Then add 1.5ml of mercuric chloride-potassium iodide-potassiumoh solution or 1.0ml of mercuric iodide-potassium iodide-potassiumoh solution (Nessler's reagent) and shake it well. - After standing for 10 minutes, measure the absorption with a 20-mm light path cuvette at a wave length of 420 mm and water as a reference. - The absorption after blank correction was used as the ordinate and the corresponding nitrogen content (ug) was used as the abyssal coordinate to draw the correction curve. A 10mm cuvette can also be used according to the mass concentration of the sample to be tested. 2. ** Exemplary Data ** - For example, some data showed that when the nitrogen content was 0.000g, the light absorption was 0.028, and when the nitrogen content was 0.005g, the light absorption was 0.055. A standard curve was drawn based on these data points (the content of nitrogen and its corresponding light absorption). For example, the data was as follows: - No. 1: Volume: 0ml, standard concentration of nitrogen nitrogen: 10 ug/ml (mass: 0 ug), absorption value: 0.096. - No. 2: Volume: 1ml, standard concentration of nitrogen nitrogen: 10 ug/ml (mass: 10 ug), light absorption value: 0.14. - Number 3: The volume is 2ml, the standard concentration of nitrogen is 10 ug/ml (mass is 20 ug), and the absorption value is 0.179. According to these data, a standard curve of the relationship between the nitrogen content and the light absorption can be drawn. This curve is generally linear, for example, it meets the linear equation of <y = 3.512x+ 0.0048>(where <y> is the corrected light absorption, and <x> is the nitrogen content), which is used to calculate the nitrogen content according to the measured light absorption. "Little Fox Fairy" is equally exciting. Everyone is welcome to click and read it!
There is color in the blank when the Nessler reagent is used to measure the nitrogen nitrogen.
There may be the following reasons for the color of the blank in the Nessler's reagent: 1. ** The characteristics of the Nessler's reagent itself **: The Nessler's reagent is a slightly yellowish green transparent solution at room temperature. As the exposure time increases, it will gradually form a yellowish brown deposit, and the solution will gradually turn yellow. If the exposure time of the Nessler's reagent in the blank experiment was too long, it might cause color to appear. 2. ** Experiment operation factors ** - ** Cuvette problem **: If a 1cm cuvette is used, the blank value of the blank absorption is too high and is greater than 0.030, which may cause color to be seen. The first reason was the purity of the reagent, such as the reagent used containing an aminium salt (such as potassium-Na tartarate); the second reason was that the test water was contaminated and the introduction of an aminium salt. - ** Inappropriate use of Nessler's reagent **: Nessler's reagent needs to be kept at room temperature before use, and it cannot be shaken before use. It should be used by absorbing the supernate. If this operation is not followed, the blank color may be affected. 3. ** Purity and contamination of reagents ** - [** Impurity in the reagent **: The order of adding the medicine in the preparation of the Nessler's reagent is different, and the phenomenon of different colors often occurs.] - ** Contained **: If the experimental water or other reagents are contaminated with either nitrogen or nitrogen, the Nessler's reagent will also produce a color reaction in the blank experiment. "Little Fox Fairy" is equally exciting. Everyone is welcome to click and read it!
How to test for nitrogen?
The test method for the colorless and pungent odor of the gas was as follows: First, it could be tested with a wet red litmus test paper. If the test paper turned blue, it proved the existence of the gas. Second, a glass rod dipped in concentrated sulfuric acid was used to approach the gas to be tested. If white smoke was produced, it indicated the existence of the gas. While waiting for the TV series, you can also click on the link below to read the classic original work of "Dafeng Nightwatchman"!
What is the nitrogen origin story?
Nitrogen's origin dates back to the early universe. In the extremely high - energy environment of the young universe, elementary particles combined and formed atoms. Nitrogen atoms were created as part of this process. Over time, in the cores of massive stars, more nitrogen was synthesized through fusion reactions. When these stars exploded as supernovae, they scattered nitrogen and other elements across the cosmos, enriching the matter that would eventually form our solar system and Earth.
A reagent for absorbing nitrogen in the laboratory
The reagents used in the laboratory to absorb nitrogen included saturated salt water (saturated NaCl-solution), acidic solutions such as calcium chloride-acid, sulfuric acid, or sulfuric acid, soda lime, quicklime, silica gel, and a white to light gray powdered solid (composed of a mixture of organic salt, metal dioxide, and surface modifying agent). Among them, saturated salt water absorbs the physical property of the water that is easily dissolved in the water, calcium chlorideabsorbs the chemical property of the octa-ammine calcium chlorideby reacting with the hydrogen gas, acidic solution absorbs the hydrogen gas by reacting with the basic hydrogen gas to produce salt and water, soda lime, quicklime, and silica gel can be used as the basic drying agent to absorb the hydrogen gas, and the hydrogen absorbing agent can absorb the nitrogen and hydrogen gas due to its multi-pore structure and suitable hole diameter. While waiting for the TV series, you can also click on the link below to read the classic original work of "Dafeng Nightwatchman"!
Checking the operation of the nitrogen gas
Mei County nitrogen fertilizer plant
Mei County Xiyang nitrogen fertilizer plant was established in 1966. It was once the largest nitrogen fertilizer plant in Meizhou City (Mei County area). At its peak, there were about 3000 formal and temporary workers. It mainly produces nitrogen fertilizers such as hydrogen carbonates. The quality of the nitrogen fertilizers produced is good, the fertilizer efficiency is high and lasting, and the seedlings will not be burned. It is very popular among farmers. At that time, to buy first-hand low-cost nitrogen fertilizer, the leader had to personally sign and approve it. Ordinary people could only buy high-priced nitrogen fertilizer that had been changed several times. It could be seen that the product was very popular. Since the 1990s, a large number of Shatian pomelo (now known as golden pomelo) was planted in Mei County. The planting of rice decreased, and the demand for hydrogen carbanate decreased. It was also affected by the import of carboric acid from Japan. In addition, large state-owned enterprises had many employees and heavy historical burdens. At the beginning of this century, production was stopped and the plant was disposed of. Now, except for the earliest bungalow (including the transformer) and the office building in front of the factory, the other buildings and equipment were basically demolished and replaced by the new factory buildings of many electronics factories. The original office building was quite different from the original after renovation, but the big chimney cut from red bricks with a diameter of about 3 meters, as well as the surrounding small chimneys, pools and other supporting facilities were relatively intact. In addition, Guangdong Province Meizhou Xiyang Nitric fertilizer plant was registered and established in Meizhou City on November 2, 2005. The registered place was Zhengwuge, Xiyang Town, Mei County. The legal person was Su Yiming. It was in the state of opening and belonged to the non-metallic mineral products industry. Its main industry was the non-metallic mineral products industry. The registered capital was 600,000 RMB.
The preparation of total nitrogen 1000 standard solution
1. If it is prepared by dissolving it in 105 ° C, dissolve it in 1L of nitrogen free distilled water, and make the concentration of it 1000g/L, you can get a total nitrogen of 1000 standard solution (because total nitrogen can be reflected by nitrogen compounds, here is the example of dissolving it). 2. If it is prepared with ** Na *, the *** Na dried at 105 ° C is dissolved in 1L of non-nitrogen distilled water, so that the *** Na concentration is 1000 g/L, and the total nitrogen 1000 standard solution can also be obtained (Here, *** Na is used as an example to reflect the total nitrogen). "Little Fox Fairy" is equally exciting. Everyone is welcome to click and read it!