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Date: 5-4-2016
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Date: 7-5-2017
1585
Date: 2-3-2018
1565
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Absorption of Gases from the Atmosphere
Gases from the atmosphere can be absorbed by the sample during handling, for example, when liquids are being poured into containers. Gases such as O2,CO2, and volatile organics may dissolve in the samples.
Oxygen may oxidize species, such as sulfite or sulfide to sulfate. Absorption of CO2 may change conductance or pH. This is why pH measurements are always made at the site. CO2 can also bring about precipitation of some metals. Dissolution of organics may lead to false positives for compounds that were actually absent. Blanks are used to check for contamination during sampling, transport, and laboratory handling.
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"خطأ فادح" في شرب القهوة يضر بالصحة
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جنرال موتورز تعترف بتباطؤ مبيعات المركبات الكهربائية
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بالصور: تواصل كوادر قسم المشاريع الهندسية في العتبة الحسينية أعمالها في مشروع تأهيل شارع طريق (كربلاء المقدسة _ بغداد) مقطع سيطرة الوند بطول (20) كم
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