توضیحات
PH متر آزمايشگاهی
PH متر آزمايشگاهی
اندازه گیری میزان اسیدی بودن مایعات در بسیاری از صنایع از قبیل صنایع غذایی ، دارویی ، صنایع کشاورزی و دامپروری ، تصفیه خانه ها ، آزمایشگاههای صنعتی و پزشکی و در سایر صنایع از مسايل مهم بوده که اندازه گیری میزان اسیدي محلولها توسط دستگاه PH متر انجام میگیرد.
PH از لغت فرانسوی Hydrogene گرفته شده، اصطلاح ph که مخفف دو کلمه Hydrogene و power است بیانگر قدرت یونی هیدروژن در آب میباشد به عبارت دیگر نسبت مولكولهای یونیزه شده به غیر یونیزه شده در محیط های آبی را pH میگویند.
روش های مختلف سنجش PH
دو روش کلی برای سنجش میزان PH در آبها وجود دارد که شامل دو روش زیر است.
1) استفاده از PH متر الکتریکی (PH متر آزمايشگاهی)
2) تعیین PH به روش رنگ سنجی ( كاغذ PH متر )
PH متر آزمايشگاهی :
اکثر اندازه گیریهای PH در آزمایشگاه با استفاده از دستگاه PH متر كه بوسیله یک مدار الکتریکی کار میکند انجام ميشود .این مدار از یک الکترود شیشه ای و یک الکترود مرجع خارجی و یک ولتمتر که پتانسیل الکتریکی را در مدار ثبت میکند، تشکیل شده است. الکترود شیشه ای از یک سیم حامل جریان تشکیل شده است که در داخل یک محلول که PH مشخص دارد فرو برده شود.
قبل از استفاده از دستگاه PH متر باید دستگاه کالیبره شود.محلولهای بافری با PH های معلوم برای چنین کاری مناسب هستند.
PHمتری به روش رنگ سنجی:
این روش شیمیایی که برای تعیین PH استفاده میشود، افزودن یک قطره از یک اندیکاتور اسید – باز به نمونه است. کاغذهای PH اندیکاتور مناسب برای اینکارهستند.
انواع PH متر آزمايشگاهی :
pH مترها را میتوان به سه گروه تقسیمبندی کرد.
-
گروه اول : pH مترهای قلمی
این pH مترها ارزان، سبک و کوچک هستند ولی دقت کمتری نسبت به نوع پرتابل و روميزي دارند
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گروه دوم : pH پرتابل
اين pH مترها نسبت به نوع قلمي کارایی بیشتری دارند.
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گروه سوم : pH روميزي
اين pH مترها رومیزی یا آزمایشگاهی هستند. pH مترهاي روميزي دارای دقت بسیار بالاتری بوده و برخی از آنها قابلیت سنجش پارامترهای متعددی علاوه بر pH را نیز دارند. این نوع برخلاف موارد قبل قابلیت حملونقل را ندارد و باید در جای ثابتی قرار بگیرند.
شرکت طيف آزما طب انواع مختلفی از pH مترها را در اختیار دارد. این دستگاهها بصورت قلمی و پرتابل و روميزي ميباشند .

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