• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Marine Chemistry >Removal of nitrite interference in the Winkler determination of dissolved oxygen in seawater
【24h】

Removal of nitrite interference in the Winkler determination of dissolved oxygen in seawater

机译：去除Winkler测定海水中溶解氧的亚硝酸盐干扰

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Nitrite is a well recognized interference in iodometry. However, while steps for its removal are part of the routine practice in the standard methods for the determination of dissolved oxygen in freshwater and waste-water when the iodometric Winkler method is used, they are not included in any of the widely used standard procedures for seawater analyses. In de-ionized reagent-grade water, artificial seawater and natural surface seawater, the concentration of apparent oxygen increased linearly with increasing concentrations of added nitrite, indicating that the presence of nitrite does lead to an over-estimation. The average ratio of increase in apparent oxygen to nitrite added was 0.4±0.1 mol mol~1. At the widely claimed accuracy and precision in the determination of dissolved oxygen in seawater of ±0.1 to ±0.3%, the interference of nitrite may be safely ignored only when the concentration of nitrite is below about 0.3 μM. At higher concentrations, such as those found at the nitrite maxima and in coastal waters, it should be taken into account. Since nitrite can be easily and readily removed by the addition of azide, such a step should be incorporated into the stan-dard procedures for the determination of dissolved oxygen in seawater.
机译：亚硝酸盐是碘量法中公认的干扰。但是，当使用碘量温克勒法测定标准方法时，除去其步骤是常规方法的一部分，用于测定淡水和废水中的溶解氧，但对于任何广泛使用的标准方法，都没有包括这些步骤。海水分析。在去离子试剂级水，人造海水和天然表层海水中，表观氧气浓度随亚硝酸盐添加量的增加而线性增加，这表明亚硝酸盐的存在确实导致过高估计。表观氧与添加的亚硝酸盐的平均增加比为0.4±0.1 mol mol〜1。在测定海水中溶解氧的准确度和精确度为±0.1至±0.3％时，只有当亚硝酸盐的浓度低于约0.3μM时，亚硝酸盐的干扰才可以安全地忽略。在较高的浓度下（例如在亚硝酸盐最大值处和沿海水域中发现的浓度），应予以考虑。由于可以通过添加叠氮化物轻松，轻松地除去亚硝酸盐，因此应将这一步骤纳入标准程序中，以测定海水中的溶解氧。

著录项

  • 来源
    《Marine Chemistry》 |2012年第20期|p.28-32|共5页
  • 作者

    George T.F. Wong;

  • 作者单位

    Research Center for Environmental Changes, Academia Sinica, 128 Sec. 2 Academia Rd., Nankang, Taipei, Taiwan, ROC Institute of Hydrology and Ocean Sciences, National Central University, Jungli 320,Taiwan, ROC;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Oxygen; Nitrite; Winkler method;

    机译：氧;亚硝酸盐温克勒法;

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号