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Mar 12 - Mar 19
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You may return most new, unopened items within 30 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
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جهاز كشف النيتروجين والفوسفور (NPD) من BUCK Scientific مع الضمان
ملحوظة: بالنسبة لجميع الطلبات الدولية، سيكون المشتري مسؤولاً بمفرده عن التخليص الجمركي والرسوم والضرائب المفروضة على العبوة.
The ceramic NPD bead is exceptionally rugged and long-lasting,
offering service from 100 to 1000 hours, depending on operating conditions.
The Nitrogen-Phosphorus Detector responds to nitrogen-phosphorus compounds about 100,000 times more strongly than normal hydrocarbons. Due to this high degree of selectivity, the NPD is commonly used to detect pesticides, herbicides, and drugs of abuse.
The NPD is similar in design to the FID, except that the hydrogen flow rate is reduced to about 3mLs/minute, and an electrically heated thermionic bead (NPD bead) is positioned near the orifice. Nitrogen or phosphorus containing molecules exiting the column collide with the hot bead and undergo a catalytic surface chemistry reaction. The resulting ions are attrtacted to a collector electrode amplified and output to the data system.
This chromatogram shows the NPD response to a 10ppm malathion sample.
EPA Method - 645 - amine pesticides and lethane by GC with NPD.pdf
EPA method - 509 - ETHYLENE THIOUREA ETU - NPD GC.pdf
EPA Method - 633_1 - Nitrogen-Containing Pesticides by NPD GC.pdf
EPA Method - 634 - Thiocarbate Pesticides by NPD GC.pdf
EPA Method - 620 - Diphenylamine by NPD GC.pdf
EPA Method - 622 - Organophosphorus Pesticides by NPD GC.pdf
EPA Method - 622_1 - Thiophosphate Pesticides by NPD GC.pdf
EPA Method - 507rev2 - NITROGEN - AND PHOSPHORUS-NPD GC.pdf
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