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Under the traffic load and kinds of natural factors, performance and bearing ability of asphalt pavement is gradually decline. So, taking timely repairs and maintenance measures on the road is quite essential, and it can also improve the pavement performance and extend the life of the road. There are varieties of maintenance programs for asphalt pavement, and each of them has its best application...
Paving overlay asphalt on an old road is generally adopted in road maintenance projects. Highway project is a linear project, diseases and the maintenance requirements of the component sections are very different. Firstly, the paper analyzes the decision-making process of maintenance program for asphalt pavement. Then, it points out that the road should be classified into some sections rationally...
The present paper describes a procedure that formaldehyde in air was preconcentrated in a membrane cell and its content was determined by adsorptive polarography. First the formaldehyde in air samples was preconcentrated in a membrane cell using water, then the formaldehyde reacted with 2,4-dinitrophenyl hydrazine to form 2,4-dinitrophenyl hydrazone, which can be adsorbed at the mercury electrode...
The present paper describes a procedure that phenols in air were preconcentrated in a membrane cell and their content was determined by adsorptive polarography. First, the phenols in air samples were preconcentrated in a membrane cell using 2.0 M NaOH solution, then in a pH 1.3 buffer solution p-bromophenylamine forms a diazoate with NaNO 2 , and into the mixture the collected phenols were...
The present paper describes a procedure in which fluorine in the air was preconcentrated in a chromatomembrane cell and its content was determined by adsorptive polarography. In a pH 4.90 buffer solution the fluorine ion can form a ternary complex with La(III) and ALC. The complex can be adsorbed at the mercury electrode and yields a sensitive oscillopolarographic wave at -0.67 V, which can be sensitized...
In a pH 7.0 buffer solution containing 0.0020% Triton X-100 CPZ yields a sensitive polarographic wave at −1.90 V, which can be used to determine trace amounts of the drug, the detection limit being 4.2 × 10−9mol/liter. Using potentiostatic coulometry, chronocoulometry, and cyclic voltammetry the electron number of electrochemical reaction, the surface concentration, and the diffusion coefficient were...
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