Brasil Reef - Fórum de Aquário - Aquarismo - Marinho, Corais e Água Doce

Celso Suguimoto escreveu:Arnaldo

Eu usei uma seringa pra medir os 5ml e olha a diferença entre os tres tubos da esquerda. Na direita usei 10ml medidos na seringa tbem... Creio q o erro na medida diminua usando 10ml pela marcas de referencia do tubo, talvez por isso o Marco tenha conseguido chegar perto dos valores da ELOS

O primeiro tubo nao é da Alcon... Todos os tres primeiros usaram exatamente a mesma medida usando uma seringa e conferidos intercambiando a água entre eles.



Usando 5ml medidos com a seringa bateu com o teste da Elos do Reinaldo Chen em um teste q estamos fazendo. Se usar a medida do tubo, da uma diferenca de 2 DkH

No passado eu e o Beto fizemos um teste usando o Alcon e Tropic Marin, bateu e eu sempre achei q era confiavel, mas usamos o tubo da Tropic. Recentemente em um post aqui na Brasilreef alertaram pra precisao dos tubos... e fui checar

Celso Suguimoto escreveu:Arnaldo

Eu usei uma seringa pra medir os 5ml e olha a diferença entre os tres tubos da esquerda. Na direita usei 10ml medidos na seringa tbem... Creio q o erro na medida diminua usando 10ml pela marcas de referencia do tubo, talvez por isso o Marco tenha conseguido chegar perto dos valores da ELOS

O primeiro tubo nao é da Alcon... Todos os tres primeiros usaram exatamente a mesma medida usando uma seringa e conferidos intercambiando a água entre eles.



Usando 5ml medidos com a seringa bateu com o teste da Elos do Reinaldo Chen em um teste q estamos fazendo. Se usar a medida do tubo, da uma diferenca de 2 DkH

No passado eu e o Beto fizemos um teste usando o Alcon e Tropic Marin, bateu e eu sempre achei q era confiavel, mas usamos o tubo da Tropic. Recentemente em um post aqui na Brasilreef alertaram pra precisao dos tubos... e fui checar

Salifert and Seachem test kits performed well in this ‘competition’. Both were within approximately 10-11% of the ‘true’ alkalinity value. Does it really matter to you that alkalinity is 3.3 meq/l but is reported at 3 meq/l? No two situations are exactly alike, but, generally, these easy-to-perform tests deliver results that should be acceptable to the majority of hobbyists.

The Tetra test did not perform as well. It is difficult for me to believe that the reagent was properly prepared at the factory. I tend to think the reagent was simply old and had lost potency.

And this brings up a point – Only Salifert marks their reagents with an expiration date. Although shelf life is probably at least year or more with the others, it would be comforting to know that reagents are fresh. Expiration dates are standard on Hach reagents, and it is not unheard of in the pet industry (besides Salifert, I seem to recall the German company Dupla once - and perhaps still does - marked their reagents with an expiration date). However, Seachem, on their website, states they will replace ‘old’ reagents (see that site for details).

As a general rule, reagents should be discarded 6 months after being opened. It is good lab practice to mark the bottle with the date it was opened. Project your realistic use of these kits – how often will you perform alkalinity tests in the next six months? Although large amounts of reagent might seem like a good idea, chemicals could ‘spoil’ on the shelf while waiting for use or become contaminated with use.

The Rea Sea test is, at least in this grouping, in a category of its own in that it simply reports alkalinity in rather vague ranges. This is not to say that the kit is without use – those wanting to monitor the buffering capacity of marine fish-only aquaria might find this test of value.

No Material Safety Data Sheets (MSDS) are included with any of the kits, and I did not find them on the company websites (www.redseafish.com; www.salifert.com, www.Seachem.com, and www.tetra.com). Having this information readily available would seem a good idea.