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Date: 2-3-2018
1082
Date: 19-3-2016
1702
Date: 24-6-2017
1312
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System or Instrument Blank
It is a measure of system contamination and isthe instrumental respo n se in the abs ence of any sample. When the background signal is constant and measurable, the usual practice is to considerthat level to be the zero setting. It is generally used for analytical instrumentsbut is also applicable for instruments for sample preparation The instrument blank also identifies memory effects or carryover fro mprevious samples. It may become significant when a low-concentrationsample is analyzed immediately after a high concentration sample. This isespecially true where preconcentration and cryogenic steps are involved. Forexample, during the purge and trap analysis of volatile organics, somecomponents may be left behind in the sorbent trap or at a cold spot in theinstrument. So it is a common practice to run a deionized water blankbetween samples. These blanks are critical in any instrument, where samplecomponents may be left behind only to emerge during the next analysis
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طبيبة تبدد 5 خرافات رئيسية عن تغذية الأطفال
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وفاة أول رجل خضع لزراعة كلية خنزير.. والمستشفى يوضح الأسباب
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جامعة العميد وقسم الشؤون الفكرية يعقدان شراكة علمية حول مجلة (تسليم)
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قسم الشؤون الفكريّة يفتتح باب التسجيل في دورات المواهب
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ضمن فعّاليات مخيم بنات العقيدة التاسع عشر شعبة مدارس الكفيل تنظّم ورشة إرشادية حول حلّ المشكلات واتّخاذ القرار
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