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!
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 color ph range
When Nessler's reagent was used for the determination of nitrogen and nitrogen, the suitable range of color should be controlled between 11.8 - 13.4. When the pH-value was lower than 11.8, there would be no color reaction; when the pH-value was higher than 13.4, the solution would immediately become turbid, and the absorption could not be measured. However, some studies have shown that the optimal color development is at a pH11.8 - 12.4. "Little Fox Fairy" is equally exciting. Everyone is welcome to click and read it!
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.
How much is a bottle of Nessler's reagent
There were various prices for Nessler's reagent. For example, a 100ml bottle of Nessler's reagent cost 118.50 yuan, a 500ml bottle of Nessler's reagent cost 64.6 yuan, and some cost 9 yuan. "Little Fox Fairy" is equally exciting. Everyone is welcome to click and read it!
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!
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.
How is the relationship between nitrogen and comic strips?
I'm not really sure. There doesn't seem to be an obvious connection between nitrogen and comic strips.
The reason why nitrogen dioxide is easily liquefied
Usually, the easiness of a substance to liquify was related to the interaction between molecules. There was a van der Waals force between the molecules of nitrogen dioxide (NO2). Its relative molecular mass was 46.01, which was relatively large, and the van der Waals force between the molecules was relatively strong. Under this strong intermolecular force, the nitrogen dioxide molecules were easier to approach and gather with each other, making it easy to change from a gaseous state to a liquid state under certain conditions. The novel "Watching the Moon on Fish Island" is equally exciting. Everyone is welcome to click and read it!
Can you briefly tell the nitrogen origin story?
Nitrogen originated from stellar processes. Inside stars, reactions created it from other elements. When stars died in violent explosions, nitrogen was dispersed, eventually finding its way into our part of the universe.
What does the comic strip of the nitrogen cycle depict?
The comic strip usually shows the various processes and steps involved in the nitrogen cycle, like nitrogen fixation, nitrification, and denitrification.