...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Marine Chemistry >Impurities in indicators used for spectrophotometric seawater pH measurements: Assessment and remedies
【24h】

Impurities in indicators used for spectrophotometric seawater pH measurements: Assessment and remedies

机译：用于分光光度法海水pH测量的指示剂中的杂质：评估和补救措施

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

Spectrophotometric pH measurements have been widely used in oceanic CO_2-system research. However, impurities in indicator dyes from different manufacturers may cause uncertainty in measured pH values. In this work we report initial findings surrounding the potential significance of indicator sources (manufacturers) on pH measurements obtained with the sulfonephthalein indicator m-cresol purple. HPLC analyses were used for comparative assessments of impurities in m-cresol purple obtained from a range of manufacturers. Results indicate that m-cresol purple from different manufacturers, and perhaps from different batches of the same manufacturer, have different types and quantities of light-absorbing impurities. Impurities can contribute to pH offsets as large as 0.01 pH units. The pH offset caused by impurities decreases with decreasing sample pH. Indicators can be purified using preparative HPLC. Until purified indicators and refined indicator calibrations become available, we suggest that investigators should reserve some portion of each indicator batch for comparison with the properties of purified indicators.
机译：分光光度法pH测量已广泛用于海洋CO_2系统研究。但是，来自不同制造商的指示剂染料中的杂质可能会导致测量的pH值不确定。在这项工作中，我们报告了最初的发现，这些发现围绕着指示剂来源（制造商）在用磺酞指示剂间甲酚紫获得的pH测量中的潜在重要性。 HPLC分析用于比较评估从一系列制造商处获得的间甲酚紫中的杂质。结果表明，来自不同制造商（也许来自同一制造商的不同批次）的间甲酚紫具有不同类型和数量的吸光杂质。杂质会导致高达0.01个pH单位的pH偏移。杂质引起的pH偏移随着样品pH的降低而降低。指示剂可以使用制备型HPLC纯化。在纯化的指标和精细的指标校准可用之前，我们建议研究人员应保留每批指标的一部分，以便与纯化的指标的性质进行比较。

著录项

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