Base-free experimental reagents keep things away from the laboratory

Laboratory safety has always been a matter of great concern, and has increasingly become a potential threat to the health of laboratory operators. The social impact caused by the security accident and the injury to the experimenters are urgent problems to be solved. Pre-made reagents have unparalleled advantages in daily analysis and testing.

In recent years, there have been many laboratory safety incidents, such as the explosion of the 3rd floor of the Energy and Chemical Laboratory of Ningxia University in the National Key Laboratory of Coal Chemical Industry in 2013, which caused two windows to be damaged and two students were slightly injured; 2012 In May, a fire accident occurred in a laboratory in Shanghai Yongcan Chemical Co., Ltd., located at 326 Edison Road, Pudong New Area. Fortunately, the employees were evacuated in time and there were no casualties;

In February 2012, formaldehyde leaked from a laboratory on the 6th floor of the Chemistry Building of the Gulou Campus of Nanjing University. Formaldehyde leaked from a reactor with a capacity of two or three liters. Formaldehyde is a synthetic substance of the experiment and is stored in the reactor. After learning from the school, the school learned that a teacher was doing experiments in this laboratory, but went out for two or three minutes, and during this time, a formaldehyde leak occurred.

The traditional national standard method usually includes pretreatment, heating and refluxing, and titration. The reagents used are mostly heavy metal ions such as concentrated sulfuric acid, potassium permanganate and potassium dichromate. These metal ions invisibly pose a serious threat to the health of operators. When using concentrated sulfuric acid a little carelessly, it will splash on clothing or skin and cause injury. Hach's pre-made reagents are ready-to-use chemical reagent kits or chemical reagent kits. There is no need for cumbersome weighing and dilution of chemical reagents during use. Simply dilute the water sample to the concentration range specified by the reagents. measuring. To the greatest extent, the safety and health of testing personnel are guaranteed.

Take the COD test in water as an example: the traditional method widely recognized and widely used at home and abroad is the "2 hour heating reflux potassium dichromate titration method". The specific operation is: in a special heating reflux device under strong acid conditions, Use potassium dichromate to oxidize the reducing substances in the water sample. Excess potassium dichromate uses test iron as an indicator, and the standard solution of ammonium ferrous sulfate is used to drop back. The consumption of reducing substances in the water sample is calculated according to the amount The amount of oxygen. To use pre-made reagents to digest COD pre-made tube reagents in 20 minutes, just add an appropriate amount of sample to the COD pre-made tube reagent tubes, cover the lid, shake until the liquid is suspended, heat for 20 minutes, and then measure. There is no need to contact toxic and hazardous reagents during the measurement, and the sealing reaction will not splash out, causing injury.

Compared with traditional test methods, pre-made reagents have obvious advantages in terms of safety performance:

It is safe to operate and users do not need to prepare reagents by themselves (reduced reagent contact), which improves safety, makes operation easier, and increases daily processing capacity. The complex operation procedure of the national standard method requires the preparation of reagents, the amount of contact chemical reagents is large, and the technical requirements are high; the miniaturization of the reaction vessel makes the operation safer and more convenient.

The safe and non-toxic traditional international standard method requires about 6 reagents, including main reagents such as ammonium ferrous sulfate, potassium dichromate, ferric acid, concentrated sulfuric acid, silver sulfate, and masking agent mercury sulfate. Toxic substances such as ammonia and mercury, concentrated sulfuric acid and heavy metals in the raw materials have seriously endangered the health of the operators. The pre-made reagent method requires only one COD pre-made reagent, which is safe, non-toxic, and poses no threat to the health of the operator.

The environmentally friendly micro-reflux method requires only a small amount of reagents. Sealing the reagent tube can prevent harmful substances from splashing and improve the accuracy of the measurement. It also ensures the safety of the digestion process, reduces the amount of reagents and reduces the secondary environmental impact. Pollution; while the traditional international standard method consumes a lot of resources, due to the use of highly toxic mercury salts, it causes secondary pollution to the environment. After the reaction, the wastewater treatment is cumbersome, so the use of pre-made reagents is safe for the environment.

In summary, the use of pre-made reagents for measurement has the advantages of simple and fast operation, low analysis cost, low environmental protection, and simple waste liquid treatment. The unique advantages of pre-made reagents in terms of safety performance make them a helper in water quality analysis and more and more an indispensable and important part of water quality analysis. It is conducive to the daily analysis of production, scientific research, teaching and field operations with high safety requirements.

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