名稱：鉑鈷標(biāo)準(zhǔn)比色液 Pt-Co鉑鈷色度標(biāo)準(zhǔn)溶液 500黑

APHA/Pt-Co/Hazen Color Standard Solution

規(guī)格：100ml

保存：2-8℃ 避光保存

有效期：12個(gè)月

使用注意事項(xiàng)：使用前應(yīng)恒溫至20℃±4℃，并充分搖動(dòng)以保證均勻。本標(biāo)準(zhǔn)物質(zhì)打開后盡量一次性使用，使用過程中應(yīng)嚴(yán)格防止沾污。

應(yīng)用領(lǐng)域：水質(zhì)色度

標(biāo)準(zhǔn)物質(zhì)用途：色調(diào)接近Pt-Co色度的天然水、飲用水及淺色液體的色度測定標(biāo)準(zhǔn)、日常分析和檢測、檢測方法評價(jià)、儀器校準(zhǔn)、實(shí)驗(yàn)室質(zhì)量控制、認(rèn)證考核現(xiàn)場專用標(biāo)準(zhǔn)物質(zhì)。

用氯鉑酸鉀與氯化鈷配成標(biāo)準(zhǔn)色列，與水樣進(jìn)行目視比色。每升水中含有1mg 鉑和0.5mg 鈷時(shí)所具有的顏色，稱為1 度，作為標(biāo)準(zhǔn)色度單位。

如水樣渾濁，則放置澄清，亦可用離心法或用孔徑為0.45μm 濾膜過濾以去除懸浮物，但不能用濾紙過濾，因?yàn)V紙可吸附部分溶解于水的顏色。

APHA color, also referred to as the Hazen scale, and more appropriately as the Platinum Cobalt(Pt/Co) scale, is a color standard named for the American Public Health Association and defined by ASTM D1209. It was originally intended to describe the color of waste water, but its usage has expanded to include other industrial applications. APHA color is a color scale sometimes referred to as a "yellowness index" that is used to assess the quality of liquids that are clear to yellowish in color.

It is similar to the Hazen color test, to which it is sometimes incorrectly referred. The Hazen color test uses a Pt/Co solution and was developed for water treatment facilities where the Color of water could be used as a measure of concentration of dissolved and particulate material. Slight discoloration is measured in Hazen units (HU). Impurities can be deeply colored as well, for instance dissolved organic compounds called tannins can result in dark brown colors.

The scale for APHA color goes from 0 to 500 in units of parts per million of platinum cobalt to water. Zero on this scale represents distilled water, or what is more commonly called white water.

APHA standards can be used for both visual comparison and instrumental measurements. Standards can be bought pre-mixed or made by following guidelines prepared by the American Society for Testing and Materials' (ASTM). The mixture itself is an acidic solution of potassium hexachloro- platinate(IV) and cobalt(II) chloride with different levels of dilution for intermediate steps.