This work provides insights on waterpipe tobacco and waterpipe charcoal as potential sources of environmental toxicants. Selected harmful and potentially harmful constituents (HPHCs) from ten U.S. commercial waterpipe...This work provides insights on waterpipe tobacco and waterpipe charcoal as potential sources of environmental toxicants. Selected harmful and potentially harmful constituents (HPHCs) from ten U.S. commercial waterpipe tobacco filler products (before and after electric heating) and five waterpipe charcoal products (before and after burning) were investigated. The differences in quantities of HPHCs between the evaluated products appear to be affected by raw material properties and/or the manufacturing processes involved in product production. Trace metal quantities in waterpipe tobacco and charcoal products were observed after heating or burning conditions compared to unheated or unburned conditions, which could impact the environment through the generation of toxic tobacco product waste. This study demonstrates that waterpipe tobacco and waterpipe charcoal contain substantial quantities of benzo[a]pyrene (B[a]P) and trace metals (<i>i.e.</i>, selenium, arsenic, cadmium, chromium, cobalt, lead, nickel) before use and that extensive and varied changes in trace metal quantities take place as a result of heating, and more studies are needed to estimate the magnitude of the environmental impact of waterpipe tobacco use.展开更多
Peculiar characteristics of soils of Zarafshan valley are salinity with carbonates. It is recommended to introduce large amount of manure or other organic fertilizers in these soils to improve soil reclamation. But cu...Peculiar characteristics of soils of Zarafshan valley are salinity with carbonates. It is recommended to introduce large amount of manure or other organic fertilizers in these soils to improve soil reclamation. But currently there is no possibility to collect so many organic fertilizers in Uzbekistan. That is why other ways of production of organic fertilizers for improving soil fertility were searched. In the experiment, the influence of composts was studied, which prepared from tobacco wastes and manure on agrochemical properties of soils of Zarafshan valley, and production of composts from these industrial wastes, two salted with magnesium carbonates and yield-capacity of com. With the problems that exist in Uzbekistan can be solved at once. These include problems of environmental contamination through wastes and ensuring with organic fertilizers in the irrigated soils. Introduction of composts in the doze of 30 t.ha1 separately and on the background of mineral-NPK （nitrogen, phosphorus and potassium） fertilizers increased the humus content, total NPK and mobile nutritious substances in soil. It is proved that composts, prepared from tobacco wastes with their effect on the yield capacity and quality ofcoru production, can successfully substitute manure. Composts positively influence on the balance of nutritious substances in the system of soil-corn.展开更多
文摘This work provides insights on waterpipe tobacco and waterpipe charcoal as potential sources of environmental toxicants. Selected harmful and potentially harmful constituents (HPHCs) from ten U.S. commercial waterpipe tobacco filler products (before and after electric heating) and five waterpipe charcoal products (before and after burning) were investigated. The differences in quantities of HPHCs between the evaluated products appear to be affected by raw material properties and/or the manufacturing processes involved in product production. Trace metal quantities in waterpipe tobacco and charcoal products were observed after heating or burning conditions compared to unheated or unburned conditions, which could impact the environment through the generation of toxic tobacco product waste. This study demonstrates that waterpipe tobacco and waterpipe charcoal contain substantial quantities of benzo[a]pyrene (B[a]P) and trace metals (<i>i.e.</i>, selenium, arsenic, cadmium, chromium, cobalt, lead, nickel) before use and that extensive and varied changes in trace metal quantities take place as a result of heating, and more studies are needed to estimate the magnitude of the environmental impact of waterpipe tobacco use.
文摘Peculiar characteristics of soils of Zarafshan valley are salinity with carbonates. It is recommended to introduce large amount of manure or other organic fertilizers in these soils to improve soil reclamation. But currently there is no possibility to collect so many organic fertilizers in Uzbekistan. That is why other ways of production of organic fertilizers for improving soil fertility were searched. In the experiment, the influence of composts was studied, which prepared from tobacco wastes and manure on agrochemical properties of soils of Zarafshan valley, and production of composts from these industrial wastes, two salted with magnesium carbonates and yield-capacity of com. With the problems that exist in Uzbekistan can be solved at once. These include problems of environmental contamination through wastes and ensuring with organic fertilizers in the irrigated soils. Introduction of composts in the doze of 30 t.ha1 separately and on the background of mineral-NPK （nitrogen, phosphorus and potassium） fertilizers increased the humus content, total NPK and mobile nutritious substances in soil. It is proved that composts, prepared from tobacco wastes with their effect on the yield capacity and quality ofcoru production, can successfully substitute manure. Composts positively influence on the balance of nutritious substances in the system of soil-corn.
