Spectrum Chemical Manufacturing Corp. Products
0.05 PERCENT TRIFLUOROACETIC ACID IN ACETONITRILE, MOBILE PHASE
0.05 PERCENT TRIFLUOROACETIC ACID IN ACETONITRILE, MOBILE PHASE
0.05 PERCENT TRIFLUOROACETIC ACID IN WATER, MOBILE PHASE
0.05 PERCENT TRIFLUOROACETIC ACID IN WATER, MOBILE PHASE
0.18M SODIUM CARBONATE (NA2CO3)/ 0.17M (NAHCO3 SODIUM
0.18M SODIUM CARBONATE (NA2CO3)/ 0.17M (NAHCO3 SODIUM
0.1M NABR IC STANDARD IN H20
0.1M NABR IC STANDARD IN H20
0.1M NACL IC STANDARD IN H20
0.1M NACL IC STANDARD IN H20
0.1M NAF IC STANDARD IN H20
0.1M NAF IC STANDARD IN H20
0.5M SODIUM BICARBONATE (NAHCO3) ELUENT CONCENTRATE
0.5M SODIUM BICARBONATE (NAHCO3) ELUENT CONCENTRATE
0.5M SODIUM CARBONATE (NA2CO3) ELUENT CONCENTRATE
0.5M SODIUM CARBONATE (NA2CO3) ELUENT CONCENTRATE
1 - 2 - 3 - 4-TETRAMETHYLBENZENE - 1000 PPM
1 - 2 - 3 - 4-TETRAMETHYLBENZENE - 1000 PPM
1 - 2 - 4 - 5-TETRACHLORO-3-NITROBENZENE - 1000 PPM
1 - 2 - 4 - 5-TETRACHLORO-3-NITROBENZENE - 1000 PPM
1 - 2-PHENYLENEDIAMINE 1000 PPM
1 - 2-PHENYLENEDIAMINE 1000 PPM
1 - 3 - 5-TRINITRIBENZENE - 1000 PPM
1 - 3 - 5-TRINITRIBENZENE - 1000 PPM
1 - 3-BUTADIENE DIEPOXIDE - 1000 PPM
1 - 3-BUTADIENE DIEPOXIDE - 1000 PPM
1 - 3-PHENYLENEDIAMINE 1000 PPM
1 - 3-PHENYLENEDIAMINE 1000 PPM
1 - 4-PENTANEDIOL 1000 PPM
1 - 4-PENTANEDIOL 1000 PPM
1 - 4-PHENYLENEDIAMINE 1000 PPM
1 - 4-PHENYLENEDIAMINE 1000 PPM
10 PPM CU 65 ISOTOPE STANDARD IN 2 PERCENTHNO3
10 PPM CU 65 ISOTOPE STANDARD IN 2 PERCENTHNO3
10 PPM PB 206 ISOTOPE STANDARD IN 2 PERCENT HNO3
10 PPM PB 206 ISOTOPE STANDARD IN 2 PERCENT HNO3
10 PPM PB 207 ISOTOPE STANDARD IN 2 PERCENT HNO3
10 PPM PB 207 ISOTOPE STANDARD IN 2 PERCENT HNO3
10 PPM SCANDIUM ICP/ICPMS STD IN 2 PERCENTHNO3
10 PPM SCANDIUM ICP/ICPMS STD IN 2 PERCENTHNO3
10 PPM SR 86 ISOTOPE STANDARD IN 2 PERCENT HNO3
10 PPM SR 86 ISOTOPE STANDARD IN 2 PERCENT HNO3
10 PPM ZN 68 ISOTOPE STANDARD IN 2 PERCENT HNO3
10 PPM ZN 68 ISOTOPE STANDARD IN 2 PERCENT HNO3
100 PPM LI 6 ISOTOPE STANDARD IN 2 PERCENTHNO3
100 PPM LI 6 ISOTOPE STANDARD IN 2 PERCENTHNO3
100 PPM SULFUR IN NO. 2 DIESEL FUEL
100 PPM SULFUR IN NO. 2 DIESEL FUEL
1000 AMMONIA NITROGEN/H20
1000 AMMONIA NITROGEN/H20
1000 PPM 1,2,3 TRIMETHYLBENZENE
1000 PPM 1,2,3 TRIMETHYLBENZENE
1000 PPM 1,4-NAPHTHOQUINONE
1000 PPM 1,4-NAPHTHOQUINONE
1000 PPM 2,4,6-TRICHLOROPHENOL
1000 PPM 2,4,6-TRICHLOROPHENOL
1000 PPM 2-AMINONAPTHALENE
1000 PPM 2-AMINONAPTHALENE
1000 PPM 2-METHOXY-5-METHYLANILINE
1000 PPM 2-METHOXY-5-METHYLANILINE
1000 PPM 4-AMINOPHENYLETHER
1000 PPM 4-AMINOPHENYLETHER
1000 PPM ACETATE IN WATER
1000 PPM ACETATE IN WATER
1000 PPM ACRYLAMIDE
1000 PPM ACRYLAMIDE
1000 PPM ALPHA-BHC
1000 PPM ALPHA-BHC
1000 PPM ALUMINUM ICP STD IN 2-5 PERCENT HNO3, AL(NO3)3.9H2O IN 2-5 PERCENT HNO3, 1,000 UG/ML
1000 PPM ALUMINUM ICP STD IN 2-5 PERCENT HNO3,
1000 PPM AMMONIUM IN H2O
1000 PPM AMMONIUM IN H2O
1000 PPM ANTIMONY ICP STD 20 PERCENT HCL IN TEFLON, SB2O3 IN 20 PERCENT HCL, 1,000 UG/ML
1000 PPM ANTIMONY ICP STD 20 PERCENT HCL IN TEFLON, SB2O3 IN
1000 PPM ANTIMONY IN DILUTE HCL
1000 PPM ANTIMONY IN DILUTE HCL
1000 PPM ANTIMONY STD H2O TARTARIC ACID TR. HNO3
1000 PPM ANTIMONY STD H2O TARTARIC ACID TR. HNO3
1000 PPM ARSENIC 3 IN 2-5 PERCENT HCL
1000 PPM ARSENIC 3 IN 2-5 PERCENT HCL
1000 PPM ARSENIC 5 IN H2O
1000 PPM ARSENIC 5 IN H2O
1000 PPM ARSENIC ICP STD IN 2-5 PERCENT HNO3, H3ASO4.1/2H2O IN 2-5 PERCENT HNO3, 1,000 UG/ML
1000 PPM ARSENIC ICP STD IN 2-5 PERCENT HNO3,
1000 PPM ASPON
1000 PPM ASPON
1000 PPM BARIUM ICP STD IN 2-5 PERCENT HNO3, BACO3 IN 2-5 PERCENT HNO3, 1,000 UG/ML
1000 PPM BARIUM ICP STD IN 2-5 PERCENT HNO3, BACO3 IN 2-5 PERCENT
1000 PPM BARIUM IN 0.2 PERCENT HNO3
1000 PPM BARIUM IN 0.2 PERCENT HNO3
1000 PPM BENFLURALIN
1000 PPM BENFLURALIN
1000 PPM BROMOPHOS METHYL
1000 PPM BROMOPHOS METHYL
1000 PPM BUTYRIC ACID
1000 PPM BUTYRIC ACID
1000 PPM CADMIUM ICP STD IN 2-5 PERCENT HCL, CD IN 2-5 PERCENT HCL, 1,000 UG/ML
1000 PPM CADMIUM ICP STD IN 2-5 PERCENT HCL, CD IN 2-5 PERCENT HCL,
1000 PPM CADMIUM ICP STD IN 2-5 PERCENT HNO3, CD IN 2-5 PERCENT HNO3, 1,000 UG/ML
1000 PPM CADMIUM ICP STD IN 2-5 PERCENT HNO3, CD IN 2-5 PERCENT
1000 PPM CADMIUM IN 2-5 PERCENT HNO3
1000 PPM CADMIUM IN 2-5 PERCENT HNO3
1000 PPM CALCIUM ICP STD IN 2-5 PERCENT HCL, CACO3 IN 2-5 PERCENT HCL, 1,000 UG/ML
1000 PPM CALCIUM ICP STD IN 2-5 PERCENT HCL, CACO3 IN 2-5 PERCENT
1000 PPM CALCIUM ICP STD IN 2-5 PERCENT HNO3, CACO3 IN 2-5 PERCENT HNO3, 1,000 UG/ML
1000 PPM CALCIUM ICP STD IN 2-5 PERCENT HNO3, CACO3 IN 2-5
1000 PPM CALCIUM IN 0.2 PERCENT HNO3
1000 PPM CALCIUM IN 0.2 PERCENT HNO3
1000 PPM CAPTAFOL
1000 PPM CAPTAFOL
1000 PPM CARBOPHENATHION
1000 PPM CARBOPHENATHION
1000 PPM CARBOXIN
1000 PPM CARBOXIN
1000 PPM CHROMIUM 3 IN 2-5 PERCENT HNO3
1000 PPM CHROMIUM 3 IN 2-5 PERCENT HNO3
1000 PPM CHROMIUM 6 IN H2O
1000 PPM CHROMIUM 6 IN H2O
1000 PPM CIS-NONACHLOR
1000 PPM CIS-NONACHLOR
1000 PPM COMPLEX CYANIDE IN KOH.
1000 PPM COMPLEX CYANIDE IN KOH.
1000 PPM COPPER ICP STD IN 2-5 PERCENT HNO3, CU IN 2-5 PERCENT HNO3, 1,000 UG/ML
1000 PPM COPPER ICP STD IN 2-5 PERCENT HNO3, CU IN 2-5 PERCENT HNO3,
1000 PPM COPPER IN 2-5 PERCENT HNO3
1000 PPM COPPER IN 2-5 PERCENT HNO3
1000 PPM CROTOXYPHOS
1000 PPM CROTOXYPHOS
1000 PPM DIAZINON
1000 PPM DIAZINON
1000 PPM DICHLOFENTHION
1000 PPM DICHLOFENTHION
1000 PPM DIPHENYLAMINE
1000 PPM DIPHENYLAMINE
1000 PPM DYFONATE (FONOFOS)
1000 PPM DYFONATE (FONOFOS)
1000 PPM EPN
1000 PPM EPN
1000 PPM FENITROTHION
1000 PPM FENITROTHION
1000 PPM FENSULFOTHION
1000 PPM FENSULFOTHION
1000 PPM FORMATE IN WATER
1000 PPM FORMATE IN WATER
1000 PPM GALLIUM IN 2 PERCENT HNO3, GA IN 2-5 PERCENT HNO3, 1,000 UG/ML
1000 PPM GALLIUM IN 2 PERCENT HNO3, GA IN 2-5 PERCENT HNO3, 1,000 UG/ML
1000 PPM GERMANIUM IN H2O, (NH4)2GEF6 IN H2O/TR HF, 1,000 UG/ML
1000 PPM GERMANIUM IN H2O, (NH4)2GEF6 IN H2O/TR HF, 1,000 UG/ML
1000 PPM GOLD IN 10 PERCENT HCL, AU IN 10 PERCENT HCL, 1,000 UG/ML
1000 PPM GOLD IN 10 PERCENT HCL, AU IN 10 PERCENT HCL, 1,000 UG/ML
1000 PPM HEPTACHLOR EPOXIDE IN METHANOL
1000 PPM HEPTACHLOR EPOXIDE IN METHANOL
1000 PPM IMIDAN
1000 PPM IMIDAN
1000 PPM IODIDE IN H2O
1000 PPM IODIDE IN H2O
1000 PPM LANTHANUM IN 2 PERCENT HNO3, LA2O3 IN 2-5 PERCENT HNO3, 1,000 UG/ML
1000 PPM LANTHANUM IN 2 PERCENT HNO3, LA2O3 IN 2-5 PERCENT HNO3, 1,000
1000 PPM LEAD 2 IN 2-5 PERCENT HNO3
1000 PPM LEAD 2 IN 2-5 PERCENT HNO3
1000 PPM LEAD ICP STD IN 2-5 PERCENT HNO3, PB(NO3)2 IN 2-5 PERCENT HNO3, 1,000 UG/ML
1000 PPM LEAD ICP STD IN 2-5 PERCENT HNO3, PB(NO3)2 IN 2-5
1000 PPM LEPTOPHOS
1000 PPM LEPTOPHOS
1000 PPM LITHIUM ICP STD IN 2-5 PERCENT HCL, LI2CO3 IN 2-5 PERCENT HCL, 1,000 UG/ML
1000 PPM LITHIUM ICP STD IN 2-5 PERCENT HCL, LI2CO3 IN 2-5 PERCENT
1000 PPM LITHIUM ICP STD IN 2-5 PERCENT HNO3, LI2CO3 IN 2-5 PERCENT HNO3, 1,000 UG/ML
1000 PPM LITHIUM ICP STD IN 2-5 PERCENT HNO3, LI2CO3 IN 2-5
1000 PPM LITHIUM IN 0.2 PERCENT HNO3
1000 PPM LITHIUM IN 0.2 PERCENT HNO3
1000 PPM MAGNESIUM ICP STD IN 2-5 PERCENT HNO3, MG IN 2-5 PERCENT HNO3, 1,000 UG/ML
1000 PPM MAGNESIUM ICP STD IN 2-5 PERCENT HNO3, MG IN 2-5 PERCENT
1000 PPM MAGNESIUM IN 0.2 PERCENT HNO3
1000 PPM MAGNESIUM IN 0.2 PERCENT HNO3
1000 PPM MANCOZEB
1000 PPM MANCOZEB
1000 PPM MERCURY 2 IN 2-5 PERCENT HNO3
1000 PPM MERCURY 2 IN 2-5 PERCENT HNO3
1000 PPM MERCURY IN 10 PERCENT HNO3
1000 PPM MERCURY IN 10 PERCENT HNO3
1000 PPM METALAXYL
1000 PPM METALAXYL
1000 PPM METHIOCARB
1000 PPM METHIOCARB
1000 PPM METHYL ACETATE IN METHANOL
1000 PPM METHYL ACETATE IN METHANOL
1000 PPM MIREX
1000 PPM MIREX
1000 PPM MONOCROTOPHOS
1000 PPM MONOCROTOPHOS
1000 PPM MONOLINURON IN ACETONITRILE
1000 PPM MONOLINURON IN ACETONITRILE
1000 PPM NICKEL ICP STD IN 2-5 PERCENT HNO3, NI IN 2-5 PERCENT HNO3, 1,000 UG/ML
1000 PPM NICKEL ICP STD IN 2-5 PERCENT HNO3, NI IN 2-5 PERCENT HNO3,
1000 PPM NICKEL ICP STD IN 2-5 PERCENT HNO3, NI IN 2-5 PERCENT HNO3, 1,000 UG/ML
1000 PPM NICKEL ICP STD IN 2-5 PERCENT HNO3, NI IN 2-5 PERCENT HNO3,
1000 PPM NICKEL ICP STD IN 2-5 PERCENT HNO3, NI IN 2-5 PERCENT HNO3, 1,000 UG/ML
1000 PPM NICKEL ICP STD IN 2-5 PERCENT HNO3, NI IN 2-5 PERCENT HNO3,
1000 PPM NIOBIUM ICP STD IN H2O, NH4NBF6 IN H2O/TR HF, 1,000 UG/ML
1000 PPM NIOBIUM ICP STD IN H2O, NH4NBF6 IN H2O/TR HF, 1,000 UG/ML
1000 PPM N-PHOSPHOROMETHYLGLYCINE
1000 PPM N-PHOSPHOROMETHYLGLYCINE
1000 PPM OMETHOATE
1000 PPM OMETHOATE
1000 PPM O,P-DDD
1000 PPM O,P-DDD
1000 PPM OXAMYL
1000 PPM OXAMYL
1000 PPM PALLADIUM IN 10 PERCENT HCL, PD IN 10 PERCENT HCL, 1,000 UG/ML
1000 PPM PALLADIUM IN 10 PERCENT HCL, PD IN 10 PERCENT HCL, 1,000 UG/ML
1000 PPM PERCHLORATE IN WATER
1000 PPM PERCHLORATE IN WATER
1000 PPM PHOSALONE
1000 PPM PHOSALONE
1000 PPM PHOSPHAMIDON
1000 PPM PHOSPHAMIDON
1000 PPM PHOSPHORUS ICP STD IN H2O, NH4H2PO4 IN H2O, 1,000 UG/ML
1000 PPM PHOSPHORUS ICP STD IN H2O, NH4H2PO4 IN H2O, 1,000 UG/ML
1000 PPM PIRIMICARB
1000 PPM PIRIMICARB
1000 PPM PIRIMIPHOS-METHYL
1000 PPM PIRIMIPHOS-METHYL
1000 PPM PLATINUM ICP STD IN 10 PERCENT HCL, PT IN 10 PERCENT HCL, 1,000 UG/ML
1000 PPM PLATINUM ICP STD IN 10 PERCENT HCL, PT IN 10 PERCENT HCL,
1000 PPM POTASSIUM ICP STD IN 2-5 PERCENT HCL, KCL IN 2-5 PERCENT HCL, 1,000 UG/ML
1000 PPM POTASSIUM ICP STD IN 2-5 PERCENT HCL, KCL IN 2-5 PERCENT
1000 PPM POTASSIUM ICP STD IN 2-5 PERCENT HNO3, KNO3 IN 2-5 PERCENT HNO3, 1,000 UG/ML
1000 PPM POTASSIUM ICP STD IN 2-5 PERCENT HNO3, KNO3 IN 2-5
1000 PPM POTASSIUM IN 0.2 PERCENT HNO3
1000 PPM POTASSIUM IN 0.2 PERCENT HNO3
1000 PPM P,P-DDE
1000 PPM P,P-DDE
1000 PPM P,P-METHOXYCHLOR IN METHANOL
1000 PPM P,P-METHOXYCHLOR IN METHANOL
1000 PPM PRASEODYMIUM ICP STD IN 2-5 PERCENT HNO3, PR6O11 IN 2-5 PERCENT HNO3, 1,000 UG/ML
1000 PPM PRASEODYMIUM ICP STD IN 2-5 PERCENT HNO3, PR6O11
1000 PPM PROPICONAZOLE
1000 PPM PROPICONAZOLE
1000 PPM PROPYZAMIDE
1000 PPM PROPYZAMIDE
1000 PPM RHENIUM ICP STD IN H2O, NH4REO4 IN H2O, 1,000 UG/ML
1000 PPM RHENIUM ICP STD IN H2O, NH4REO4 IN H2O, 1,000 UG/ML
1000 PPM RHODIUM ICP STD IN 10 PERCENT HCL, RHCL3.3H2O IN 10 PERCENT HCL, 1,000 UG/ML
1000 PPM RHODIUM ICP STD IN 10 PERCENT HCL, RHCL3.3H2O IN 10
1000 PPM RUBIDIUM IN 2 PERCENT HNO3, RBNO3 IN 2-5 PERCENT HNO3, 1,000 UG/ML
1000 PPM RUBIDIUM IN 2 PERCENT HNO3, RBNO3 IN 2-5 PERCENT HNO3, 1,000 UG/ML
1000 PPM RUTHENIUM ICP STD IN 10 PERCENT HCL, RUCL3.3H2O IN 10 PERCENT HCL, 1,000 UG/ML
1000 PPM RUTHENIUM ICP STD IN 10 PERCENT HCL, RUCL3.3H2O IN 10
1000 PPM SAMARIUM ICP STD IN 2-5 PERCENT HNO3, SM2O3 IN 2-5 PERCENT HNO3, 1,000 UG/ML
1000 PPM SAMARIUM ICP STD IN 2-5 PERCENT HNO3, SM2O3 IN 2-5
1000 PPM SANMARTON
1000 PPM SANMARTON
1000 PPM SCANDIUM ICP STD IN 2-5 PERCENT HNO3, SC2O3 IN 2-5 PERCENT HMO3, 1,000 UG/ML
1000 PPM SCANDIUM ICP STD IN 2-5 PERCENT HNO3, SC2O3 IN 2-5
1000 PPM SELENIUM 4 IN 2-5 PERCENT HNO3
1000 PPM SELENIUM 4 IN 2-5 PERCENT HNO3
1000 PPM SELENIUM 6 IN H2O
1000 PPM SELENIUM 6 IN H2O
1000 PPM SELENIUM ICP STD IN 2-5 PERCENT HNO3, SE IN 2-5 PERCENT HNO3, 1,000 UG/ML
1000 PPM SELENIUM ICP STD IN 2-5 PERCENT HNO3, SE IN 2-5 PERCENT
1000 PPM SILICON ICP STD IN H2O, NA2SIO3.9H2O IN H2O, 1,000 UG/ML
1000 PPM SILICON ICP STD IN H2O, NA2SIO3.9H2O IN H2O, 1,000 UG/ML
1000 PPM SILICON ICP STD IN H2O TR HF, (NH4)2SIF6 IN H2O/TR HF, 1,000 UG/ML
1000 PPM SILICON ICP STD IN H2O TR HF, (NH4)2SIF6 IN H2O/TR HF, 1,000 UG/ML
1000 PPM SILVER ICP STD IN 2 PERCENT HNO3, AG IN 2-5 PERCENT HNO3, 1,000 UG/ML
1000 PPM SILVER ICP STD IN 2 PERCENT HNO3, AG IN 2-5 PERCENT HNO3,
1000 PPM SIMAZINE
1000 PPM SIMAZINE
1000 PPM SIMPLE CYANIDE IN KOH
1000 PPM SIMPLE CYANIDE IN KOH
1000 PPM SODIUM ICP STD IN 2-5 PERCENT HCL, NACL IN 2-5 PERCENT HCL, 1,000 UG/ML
1000 PPM SODIUM ICP STD IN 2-5 PERCENT HCL, NACL IN 2-5 PERCENT HCL,
1000 PPM SODIUM ICP STD IN 2-5 PERCENT HNO3, NA2CO3 IN 2-5 PERCENT HNO3, 1,000 UG/ML
1000 PPM SODIUM ICP STD IN 2-5 PERCENT HNO3, NA2CO3 IN 2-5
1000 PPM SODIUM IN 0.2 PERCENT HNO3
1000 PPM SODIUM IN 0.2 PERCENT HNO3
1000 PPM STRONTIUM ICP STD IN 2-5 PERCENT HCL, SRCO3 IN 2-5 PERCENT HCL, 1,000 UG/ML
1000 PPM STRONTIUM ICP STD IN 2-5 PERCENT HCL, SRCO3 IN 2-5
1000 PPM STRONTIUM ICP STD IN 2-5 PERCENT HNO3, SRCO3 IN 2-5 PERCENT HNO3, 1,000 UG/ML
1000 PPM STRONTIUM ICP STD IN 2-5 PERCENT HNO3, SRCO3 IN 2-5
1000 PPM STRONTIUM IN 0.2 PERCENT HNO3
1000 PPM STRONTIUM IN 0.2 PERCENT HNO3
1000 PPM SULFUR ICP STD IN H2O, (NH4)2SO4 IN H2O, 1,000 UG/ML
1000 PPM SULFUR ICP STD IN H2O, (NH4)2SO4 IN H2O, 1,000 UG/ML
1000 PPM SULFUR IN NO. 2 DIESEL FUEL
1000 PPM SULFUR IN NO. 2 DIESEL FUEL
1000 PPM TANTALUM ICP STD IN H2O, NH4TAF6 IN H2O/TR HF, 1,000 UG/ML
1000 PPM TANTALUM ICP STD IN H2O, NH4TAF6 IN H2O/TR HF, 1,000 UG/ML
1000 PPM TANTALUM ICP STD IN H2O, NH4TAF6 IN H2O/TR HF, 1,000 UG/ML
1000 PPM TANTALUM ICP STD IN H2O, NH4TAF6 IN H2O/TR HF, 1,000 UG/ML
1000 PPM TELLURIUM ICP STD IN 10 PERCENT HCL, TEO2 IN 10 PERCENT HCL IN 30 PERCENT HCL, 1,000 UG/ML
1000 PPM TELLURIUM ICP STD IN 10 PERCENT HCL, TEO2
1000 PPM TELLURIUM ICP STD IN 5 PERCENT HNO3, TE IN 2-5 PERCENT HNO3, 1,000 UG/ML
1000 PPM TELLURIUM ICP STD IN 5 PERCENT HNO3, TE IN 2-5 PERCENT
1000 PPM TELLURIUM ICP STD IN 5 PERCENT HNO3, TE IN 2-5 PERCENT HNO3, 1,000 UG/ML
1000 PPM TELLURIUM ICP STD IN 5 PERCENT HNO3, TE IN 2-5 PERCENT
1000 PPM TERBIUM ICP STD IN 2-5 PERCENT HNO3, TB4O7 IN 2-5 PERCENT HNO3, 1,000 UG/ML
1000 PPM TERBIUM ICP STD IN 2-5 PERCENT HNO3, TB4O7 IN 2-5
1000 PPM TETRACHLORYINPHOS
1000 PPM TETRACHLORYINPHOS