|
libcats.org
Nitrates and nitrites in food and waterM J Hill, Knovel (Firm)From the Introduction
With regard to nitrate and nitrite, the perceived hazards are to the ecological balance in rivers and lakes, and to human health. Increased nitrate levels in river water lead to increased growth of algae and consequent decrease in the level of biologically available oxygen (BAO). In extreme forms, the algae form unsightly blooms on the water surface, and the BAO level falls below that necessary to support fish and other animal life. At this extreme, there is little dispute that efforts should be made to restore the ecological balance, and this is best achieved by reversing the increase in nitrate concentration that caused the problem. The health hazards are less clear, but include the risk of methaemoglobinaemia in young infants and the possible risk of gastric cancer, particularly in certain high-risk patient groups. These health risks have led to legislation to control the exposure of humans to nitrate from drinking water and as a food additive . . . What can be done about this and how can the problem be solved (if, indeed, there is a problem)? It is normal practice to add nitrate and nitrite to food as a cosmetic and as a preservative. Is this necessary? If so, how much do we need to add? Are there alternatives? What effect does added nitrate have on total nitrate exposure of humans? . . . In this book, we have attempted to answer, or at least to give the background to, some of the questions. . . .
Популярные книги за неделю:
![]() Тестирование Дот Ком, или Пособие по жестокому обращению с багами в интернет-стартапахАвтор: Роман Савин
Размер книги: 5.26 Mb
![]() Царство китайского языка - веселый путь овладения китайским языком. Учебник 2А и 2Б + аудиокурсАвтор: Liu Fuhua, Автор: Wang Wei, Автор: Zhou Ruian, Автор: Li Dongmei
Размер книги: 28.47 Mb
![]() Film And Television In Education: An Aesthetic Approach To The Moving Image (Falmer Press Library on Aesthetic Education)Автор: Robert Watson BКатегория: Образование
Размер книги: 917 Kb
![]() The Fictions of James Joyce and Wyndham Lewis: Monsters of Nature and DesignАвтор: Scott W. KleinКатегория: Наука (общее), Научно-популярное
Размер книги: 4.83 Mb
![]() Относительность и квантыАвтор: Эддингтон А.С.Категория: Физика, Квантовая механика
Размер книги: 2.25 Mb
Только что пользователи скачали эти книги:
![]() Foundations of Software Technology and Theoretical Computer Science: 13th Conference, Bombay, India, December 15-17, 1993. Proceedings: Proceedings of ... 1993Автор: Rudrapatna K. Shyamasundar
Размер книги: 4.56 Mb
![]() Кружок кулинарии и культуры быта. Пособие для руководителей кружковАвтор: Листова Галина СавельевнаКатегория: образование, педагогика
Размер книги: 1004 Kb
![]() Русский лапоть или почему нас не любят на ЗападеАвтор: Собчак Виктор ВладимировичКатегория: Научная литература
Размер книги: 9 Kb
![]() Numerical methods for linear control systems: design and analysis (Final draft, March 10, 2003)Автор: Biswa Nath Datta
Размер книги: 7.42 Mb
|
|