Hardness indicator
    21.
    发明授权
    Hardness indicator 失效
    硬度指示器

    公开(公告)号:US06190611B1

    公开(公告)日:2001-02-20

    申请号:US09141370

    申请日:1998-08-27

    IPC分类号: G01N3320

    CPC分类号: G01N33/1853 G01N31/22

    摘要: A harness indicator is highly reactive to a trace amount of Ca2+, and is slow to degrade in a high temperature environment of greater than 50° C. In one embodiment, the hardness indicator contains EBT, a pH buffer, and a masking agent as main components, and an admixture of Mg-EDTA. In another embodiment, the hardness indicator contains EBT, a pH buffer, and a masking agent as main components, and an admixture of anhydrous Mg-EDTA. In another embodiment, the hardness indicator contains EBT, a pH buffer, and a masking agent as main components, and an admixture of anhydrous Mg-EDTA and potassium sorbate. In a further embodiment, the hardness indicator contains EBT, a pH buffer, and a masking agent as main components, and an admixture of Mg-EDTA and potassium sorbate. In a further embodiment, the hardness indicator contains EBT, a pH buffer, and a masking agent as main components, and an admixture of potassium sorbate.

    摘要翻译: 线束指示器对痕量的Ca2 +具有高反应性,并且在大于50℃的高温环境中缓慢降解。在一个实施方案中,硬度指示剂含有EBT,pH缓冲剂和作为主要的掩蔽剂 组分和Mg-EDTA的混合物。 在另一个实施方案中,硬度指示剂含有EBT,pH缓冲剂和作为主要组分的掩蔽剂,以及无水Mg-EDTA的混合物。 在另一个实施方案中,硬度指示剂含有EBT,pH缓冲剂和掩蔽剂作为主要组分,以及无水Mg-EDTA和山梨酸钾的混合物。 在另一个实施方案中,硬度指示剂含有EBT,pH缓冲剂和掩蔽剂作为主要组分,以及Mg-EDTA和山梨酸钾的混合物。 在另一个实施方案中,硬度指示剂含有EBT,pH缓冲剂和作为主要成分的掩蔽剂,以及山梨酸钾的混合物。