Cover letter is necessary to improve the effectiveness of the work of editors and reviewers.

The cover letter must be addressed to the Editor-in-Chief Bulat Kenessov and contain the following information:

• 2-4 key results clearly proven during the reported study
• brief (2-4 sentences) description of the novelty of the reported study
• confirmation that the submitted publication is not under consideration in other journals and no ethical violations were made during the reported study
• list of 2-3 potential reviewers with their e-mails (if available)

Examples of proven results:

• the highest effectiveness of scandium extraction from water solutions is achieved by binary extractant consisting of trialkylamine and di-2-ethylhexylphosphoric acid;
• acetone concentration 30 g/L provides the highest yield of 1,1-dimethylhydrazine derivatization;
• yearly annual concentration of benzo(a)pyrene in Almaty is 15 ng/m³;
• rice husk treated at 600 ^oC during 2 h provides the highest effectiveness for the removal of aromatic hydrocarbons from the air

Reviewers evaluate if every result has been proven in the article.